From 6d0966aed44dddb45d124d0b892e187ce8afb4ff Mon Sep 17 00:00:00 2001 From: Zhongwei Li Date: Sun, 30 Nov 2025 08:24:59 +0800 Subject: [PATCH] Initial commit --- .claude-plugin/plugin.json | 12 + README.md | 3 + SKILL.md | 1050 +++++++++++++++++++++++++++ plugin.lock.json | 101 +++ references/middleware-catalog.md | 585 +++++++++++++++ references/rpc-guide.md | 542 ++++++++++++++ references/top-errors.md | 451 ++++++++++++ references/validation-libraries.md | 313 ++++++++ scripts/check-versions.sh | 74 ++ templates/context-extension.ts | 422 +++++++++++ templates/error-handling.ts | 409 +++++++++++ templates/middleware-composition.ts | 418 +++++++++++ templates/package.json | 33 + templates/routing-patterns.ts | 299 ++++++++ templates/rpc-client.ts | 268 +++++++ templates/rpc-pattern.ts | 202 ++++++ templates/validation-valibot.ts | 315 ++++++++ templates/validation-zod.ts | 428 +++++++++++ 18 files changed, 5925 insertions(+) create mode 100644 .claude-plugin/plugin.json create mode 100644 README.md create mode 100644 SKILL.md create mode 100644 plugin.lock.json create mode 100644 references/middleware-catalog.md create mode 100644 references/rpc-guide.md create mode 100644 references/top-errors.md create mode 100644 references/validation-libraries.md create mode 100755 scripts/check-versions.sh create mode 100644 templates/context-extension.ts create mode 100644 templates/error-handling.ts create mode 100644 templates/middleware-composition.ts create mode 100644 templates/package.json create mode 100644 templates/routing-patterns.ts create mode 100644 templates/rpc-client.ts create mode 100644 templates/rpc-pattern.ts create mode 100644 templates/validation-valibot.ts create mode 100644 templates/validation-zod.ts diff --git a/.claude-plugin/plugin.json b/.claude-plugin/plugin.json new file mode 100644 index 0000000..e27fc3a --- /dev/null +++ b/.claude-plugin/plugin.json @@ -0,0 +1,12 @@ +{ + "name": "hono-routing", + "description": "Build type-safe APIs with Hono - fast, lightweight routing for Cloudflare Workers, Deno, Bun, and Node.js. Set up routing patterns, middleware composition, request validation (Zod/Valibot/Typia/ArkType), RPC client/server with full type inference, and error handling with HTTPException. Use when: building APIs with Hono, setting up request validation with schema libraries, creating type-safe RPC client/server communication, implementing custom middleware chains, handling errors with HTTPException", + "version": "1.0.0", + "author": { + "name": "Jeremy Dawes", + "email": "jeremy@jezweb.net" + }, + "skills": [ + "./" + ] +} \ No newline at end of file diff --git a/README.md b/README.md new file mode 100644 index 0000000..43531ae --- /dev/null +++ b/README.md @@ -0,0 +1,3 @@ +# hono-routing + +Build type-safe APIs with Hono - fast, lightweight routing for Cloudflare Workers, Deno, Bun, and Node.js. Set up routing patterns, middleware composition, request validation (Zod/Valibot/Typia/ArkType), RPC client/server with full type inference, and error handling with HTTPException. Use when: building APIs with Hono, setting up request validation with schema libraries, creating type-safe RPC client/server communication, implementing custom middleware chains, handling errors with HTTPException diff --git a/SKILL.md b/SKILL.md new file mode 100644 index 0000000..5abd384 --- /dev/null +++ b/SKILL.md @@ -0,0 +1,1050 @@ +--- +name: hono-routing +description: | + Build type-safe APIs with Hono - fast, lightweight routing for Cloudflare Workers, Deno, Bun, and Node.js. Set up routing patterns, middleware composition, request validation (Zod/Valibot/Typia/ArkType), RPC client/server with full type inference, and error handling with HTTPException. + + Use when: building APIs with Hono, setting up request validation with schema libraries, creating type-safe RPC client/server communication, implementing custom middleware chains, handling errors with HTTPException, extending context with custom variables, or troubleshooting middleware type inference issues, validation hook confusion, RPC performance problems, or middleware response typing errors. + +license: MIT +--- + +# Hono Routing & Middleware + +**Status**: Production Ready ✅ +**Last Updated**: 2025-11-26 +**Dependencies**: None (framework-agnostic) +**Latest Versions**: hono@4.10.6, zod@4.1.13, valibot@1.2.0, @hono/zod-validator@0.7.5, @hono/valibot-validator@0.6.0 + +--- + +## Quick Start (15 Minutes) + +### 1. Install Hono + +```bash +npm install hono@4.10.6 +``` + +**Why Hono:** +- **Fast**: Built on Web Standards, runs on any JavaScript runtime +- **Lightweight**: ~10KB, no dependencies +- **Type-safe**: Full TypeScript support with type inference +- **Flexible**: Works on Cloudflare Workers, Deno, Bun, Node.js, Vercel + +### 2. Create Basic App + +```typescript +import { Hono } from 'hono' + +const app = new Hono() + +app.get('/', (c) => { + return c.json({ message: 'Hello Hono!' }) +}) + +export default app +``` + +**CRITICAL:** +- Use `c.json()`, `c.text()`, `c.html()` for responses +- Return the response (don't use `res.send()` like Express) +- Export app for runtime (Cloudflare Workers, Deno, Bun, Node.js) + +### 3. Add Request Validation + +```bash +npm install zod@4.1.13 @hono/zod-validator@0.7.5 +``` + +```typescript +import { zValidator } from '@hono/zod-validator' +import { z } from 'zod' + +const schema = z.object({ + name: z.string(), + age: z.number(), +}) + +app.post('/user', zValidator('json', schema), (c) => { + const data = c.req.valid('json') + return c.json({ success: true, data }) +}) +``` + +**Why Validation:** +- Type-safe request data +- Automatic error responses +- Runtime validation, not just TypeScript + +--- + +## The 4-Part Hono Mastery Guide + +### Part 1: Routing Patterns + +#### Route Parameters + +```typescript +// Single parameter +app.get('/users/:id', (c) => { + const id = c.req.param('id') + return c.json({ userId: id }) +}) + +// Multiple parameters +app.get('/posts/:postId/comments/:commentId', (c) => { + const { postId, commentId } = c.req.param() + return c.json({ postId, commentId }) +}) + +// Optional parameters (using wildcards) +app.get('/files/*', (c) => { + const path = c.req.param('*') + return c.json({ filePath: path }) +}) +``` + +**CRITICAL:** +- `c.req.param('name')` returns single parameter +- `c.req.param()` returns all parameters as object +- Parameters are always strings (cast to number if needed) + +#### Query Parameters + +```typescript +app.get('/search', (c) => { + // Single query param + const q = c.req.query('q') + + // Multiple query params + const { page, limit } = c.req.query() + + // Query param array (e.g., ?tag=js&tag=ts) + const tags = c.req.queries('tag') + + return c.json({ q, page, limit, tags }) +}) +``` + +**Best Practice:** +- Use validation for query params (see Part 4) +- Provide defaults for optional params +- Parse numbers/booleans from query strings + +#### Route Grouping (Sub-apps) + +```typescript +// Create sub-app +const api = new Hono() + +api.get('/users', (c) => c.json({ users: [] })) +api.get('/posts', (c) => c.json({ posts: [] })) + +// Mount sub-app +const app = new Hono() +app.route('/api', api) + +// Result: /api/users, /api/posts +``` + +**Why Group Routes:** +- Organize large applications +- Share middleware for specific routes +- Better code structure and maintainability + +--- + +### Part 2: Middleware & Validation + +**CRITICAL Middleware Rule:** +- **Always call `await next()`** in middleware to continue the chain +- Return early (without calling `next()`) to prevent handler execution +- Check `c.error` AFTER `next()` for error handling + +```typescript +app.use('/admin/*', async (c, next) => { + const token = c.req.header('Authorization') + if (!token) return c.json({ error: 'Unauthorized' }, 401) + await next() // Required! +}) +``` + +#### Built-in Middleware + +```typescript +import { Hono } from 'hono' +import { logger } from 'hono/logger' +import { cors } from 'hono/cors' +import { prettyJSON } from 'hono/pretty-json' +import { compress } from 'hono/compress' +import { cache } from 'hono/cache' + +const app = new Hono() + +// Request logging +app.use('*', logger()) + +// CORS +app.use('/api/*', cors({ + origin: 'https://example.com', + allowMethods: ['GET', 'POST', 'PUT', 'DELETE'], + allowHeaders: ['Content-Type', 'Authorization'], +})) + +// Pretty JSON (dev only) +app.use('*', prettyJSON()) + +// Compression (gzip/deflate) +app.use('*', compress()) + +// Cache responses +app.use( + '/static/*', + cache({ + cacheName: 'my-app', + cacheControl: 'max-age=3600', + }) +) +``` + +**Built-in Middleware Reference**: See `references/middleware-catalog.md` + +--- + +### Part 3: Type-Safe Context Extension + +#### Using c.set() and c.get() + +```typescript +import { Hono } from 'hono' + +type Bindings = { + DATABASE_URL: string +} + +type Variables = { + user: { + id: number + name: string + } + requestId: string +} + +const app = new Hono<{ Bindings: Bindings; Variables: Variables }>() + +// Middleware sets variables +app.use('*', async (c, next) => { + c.set('requestId', crypto.randomUUID()) + await next() +}) + +app.use('/api/*', async (c, next) => { + c.set('user', { id: 1, name: 'Alice' }) + await next() +}) + +// Route accesses variables +app.get('/api/profile', (c) => { + const user = c.get('user') // Type-safe! + const requestId = c.get('requestId') // Type-safe! + + return c.json({ user, requestId }) +}) +``` + +**CRITICAL:** +- Define `Variables` type for type-safe `c.get()` +- Define `Bindings` type for environment variables (Cloudflare Workers) +- `c.set()` in middleware, `c.get()` in handlers + +#### Custom Context Extension + +```typescript +import { Hono } from 'hono' +import type { Context } from 'hono' + +type Env = { + Variables: { + logger: { + info: (message: string) => void + error: (message: string) => void + } + } +} + +const app = new Hono() + +// Create logger middleware +app.use('*', async (c, next) => { + const logger = { + info: (msg: string) => console.log(`[INFO] ${msg}`), + error: (msg: string) => console.error(`[ERROR] ${msg}`), + } + + c.set('logger', logger) + await next() +}) + +app.get('/', (c) => { + const logger = c.get('logger') + logger.info('Hello from route') + + return c.json({ message: 'Hello' }) +}) +``` + +**Advanced Pattern**: See `templates/context-extension.ts` + +--- + +### Part 4: Request Validation + +#### Validation with Zod + +```bash +npm install zod@4.1.13 @hono/zod-validator@0.7.5 +``` + +```typescript +import { zValidator } from '@hono/zod-validator' +import { z } from 'zod' + +// Define schema +const userSchema = z.object({ + name: z.string().min(1).max(100), + email: z.string().email(), + age: z.number().int().min(18).optional(), +}) + +// Validate JSON body +app.post('/users', zValidator('json', userSchema), (c) => { + const data = c.req.valid('json') // Type-safe! + return c.json({ success: true, data }) +}) + +// Validate query params +const searchSchema = z.object({ + q: z.string(), + page: z.string().transform((val) => parseInt(val, 10)), + limit: z.string().transform((val) => parseInt(val, 10)).optional(), +}) + +app.get('/search', zValidator('query', searchSchema), (c) => { + const { q, page, limit } = c.req.valid('query') + return c.json({ q, page, limit }) +}) + +// Validate route params +const idSchema = z.object({ + id: z.string().uuid(), +}) + +app.get('/users/:id', zValidator('param', idSchema), (c) => { + const { id } = c.req.valid('param') + return c.json({ userId: id }) +}) + +// Validate headers +const headerSchema = z.object({ + 'authorization': z.string().startsWith('Bearer '), + 'content-type': z.string(), +}) + +app.post('/auth', zValidator('header', headerSchema), (c) => { + const headers = c.req.valid('header') + return c.json({ authenticated: true }) +}) +``` + +**CRITICAL:** +- **Always use `c.req.valid()`** after validation (type-safe) +- Validation targets: `json`, `query`, `param`, `header`, `form`, `cookie` +- Use `z.transform()` to convert strings to numbers/dates +- Validation errors return 400 automatically + +#### Custom Validation Hooks + +```typescript +import { zValidator } from '@hono/zod-validator' +import { HTTPException } from 'hono/http-exception' + +const schema = z.object({ + name: z.string(), + age: z.number(), +}) + +// Custom error handler +app.post( + '/users', + zValidator('json', schema, (result, c) => { + if (!result.success) { + // Custom error response + return c.json( + { + error: 'Validation failed', + issues: result.error.issues, + }, + 400 + ) + } + }), + (c) => { + const data = c.req.valid('json') + return c.json({ success: true, data }) + } +) + +// Throw HTTPException +app.post( + '/users', + zValidator('json', schema, (result, c) => { + if (!result.success) { + throw new HTTPException(400, { cause: result.error }) + } + }), + (c) => { + const data = c.req.valid('json') + return c.json({ success: true, data }) + } +) +``` + +#### Validation with Valibot + +```bash +npm install valibot@1.2.0 @hono/valibot-validator@0.6.0 +``` + +```typescript +import { vValidator } from '@hono/valibot-validator' +import * as v from 'valibot' + +const schema = v.object({ + name: v.string(), + age: v.number(), +}) + +app.post('/users', vValidator('json', schema), (c) => { + const data = c.req.valid('json') + return c.json({ success: true, data }) +}) +``` + +**Zod vs Valibot**: See `references/validation-libraries.md` + +#### Validation with Typia + +```bash +npm install typia @hono/typia-validator@0.1.2 +``` + +```typescript +import { typiaValidator } from '@hono/typia-validator' +import typia from 'typia' + +interface User { + name: string + age: number +} + +const validate = typia.createValidate() + +app.post('/users', typiaValidator('json', validate), (c) => { + const data = c.req.valid('json') + return c.json({ success: true, data }) +}) +``` + +**Why Typia:** +- Fastest validation (compile-time) +- No runtime schema definition +- AOT (Ahead-of-Time) compilation + +#### Validation with ArkType + +```bash +npm install arktype @hono/arktype-validator@2.0.1 +``` + +```typescript +import { arktypeValidator } from '@hono/arktype-validator' +import { type } from 'arktype' + +const schema = type({ + name: 'string', + age: 'number', +}) + +app.post('/users', arktypeValidator('json', schema), (c) => { + const data = c.req.valid('json') + return c.json({ success: true, data }) +}) +``` + +**Comparison**: See `references/validation-libraries.md` for detailed comparison + +--- + +### Part 5: Typed Routes (RPC) + +#### Why RPC? + +Hono's RPC feature allows **type-safe client/server communication** without manual API type definitions. The client infers types directly from the server routes. + +#### Server-Side Setup + +```typescript +// app.ts +import { Hono } from 'hono' +import { zValidator } from '@hono/zod-validator' +import { z } from 'zod' + +const app = new Hono() + +const schema = z.object({ + name: z.string(), + age: z.number(), +}) + +// Define route and export type +const route = app.post( + '/users', + zValidator('json', schema), + (c) => { + const data = c.req.valid('json') + return c.json({ success: true, data }, 201) + } +) + +// Export app type for RPC client +export type AppType = typeof route + +// OR export entire app +// export type AppType = typeof app + +export default app +``` + +**CRITICAL:** +- **Must use `const route = app.get(...)` for RPC type inference** +- Export `typeof route` or `typeof app` +- Don't use anonymous route definitions + +#### Client-Side Setup + +```typescript +// client.ts +import { hc } from 'hono/client' +import type { AppType } from './app' + +const client = hc('http://localhost:8787') + +// Type-safe API call +const res = await client.users.$post({ + json: { + name: 'Alice', + age: 30, + }, +}) + +// Response is typed! +const data = await res.json() // { success: boolean, data: { name: string, age: number } } +``` + +**Why RPC:** +- ✅ Full type inference (request + response) +- ✅ No manual type definitions +- ✅ Compile-time error checking +- ✅ Auto-complete in IDE + +#### RPC with Multiple Routes + +```typescript +// Server +const app = new Hono() + +const getUsers = app.get('/users', (c) => { + return c.json({ users: [] }) +}) + +const createUser = app.post( + '/users', + zValidator('json', userSchema), + (c) => { + const data = c.req.valid('json') + return c.json({ success: true, data }, 201) + } +) + +const getUser = app.get('/users/:id', (c) => { + const id = c.req.param('id') + return c.json({ id, name: 'Alice' }) +}) + +// Export combined type +export type AppType = typeof getUsers | typeof createUser | typeof getUser + +// Client +const client = hc('http://localhost:8787') + +// GET /users +const usersRes = await client.users.$get() + +// POST /users +const createRes = await client.users.$post({ + json: { name: 'Alice', age: 30 }, +}) + +// GET /users/:id +const userRes = await client.users[':id'].$get({ + param: { id: '123' }, +}) +``` + +#### RPC Performance Optimization + +**Problem**: Large apps with many routes cause slow type inference + +**Solution**: Export specific route groups instead of entire app + +```typescript +// ❌ Slow: Export entire app +export type AppType = typeof app + +// ✅ Fast: Export specific routes +const userRoutes = app.get('/users', ...).post('/users', ...) +export type UserRoutes = typeof userRoutes + +const postRoutes = app.get('/posts', ...).post('/posts', ...) +export type PostRoutes = typeof postRoutes + +// Client imports specific routes +import type { UserRoutes } from './app' +const userClient = hc('http://localhost:8787') +``` + +**Deep Dive**: See `references/rpc-guide.md` + +--- + +### Part 6: Error Handling + +#### HTTPException + +```typescript +import { Hono } from 'hono' +import { HTTPException } from 'hono/http-exception' + +const app = new Hono() + +app.get('/users/:id', (c) => { + const id = c.req.param('id') + + // Throw HTTPException for client errors + if (!id) { + throw new HTTPException(400, { message: 'ID is required' }) + } + + // With custom response + if (id === 'invalid') { + const res = new Response('Custom error body', { status: 400 }) + throw new HTTPException(400, { res }) + } + + return c.json({ id }) +}) +``` + +**CRITICAL:** +- Use HTTPException for **expected errors** (400, 401, 403, 404) +- Don't use for **unexpected errors** (500) - use `onError` instead +- HTTPException stops execution immediately + +#### Global Error Handler (onError) + +```typescript +import { Hono } from 'hono' +import { HTTPException } from 'hono/http-exception' + +const app = new Hono() + +// Custom error handler +app.onError((err, c) => { + // Handle HTTPException + if (err instanceof HTTPException) { + return err.getResponse() + } + + // Handle unexpected errors + console.error('Unexpected error:', err) + + return c.json( + { + error: 'Internal Server Error', + message: err.message, + }, + 500 + ) +}) + +app.get('/error', (c) => { + throw new Error('Something went wrong!') +}) +``` + +**Why onError:** +- Centralized error handling +- Consistent error responses +- Error logging and tracking + +#### Middleware Error Checking + +```typescript +app.use('*', async (c, next) => { + await next() + + // Check for errors after handler + if (c.error) { + console.error('Error in route:', c.error) + // Send to error tracking service + } +}) +``` + +#### Not Found Handler + +```typescript +app.notFound((c) => { + return c.json({ error: 'Not Found' }, 404) +}) +``` + +--- + +## Critical Rules + +### Always Do + +✅ **Call `await next()` in middleware** - Required for middleware chain execution +✅ **Return Response from handlers** - Use `c.json()`, `c.text()`, `c.html()` +✅ **Use `c.req.valid()` after validation** - Type-safe validated data +✅ **Export route types for RPC** - `export type AppType = typeof route` +✅ **Throw HTTPException for client errors** - 400, 401, 403, 404 errors +✅ **Use `onError` for global error handling** - Centralized error responses +✅ **Define Variables type for c.set/c.get** - Type-safe context variables +✅ **Use const route = app.get(...)** - Required for RPC type inference + +### Never Do + +❌ **Forget `await next()` in middleware** - Breaks middleware chain +❌ **Use `res.send()` like Express** - Not compatible with Hono +❌ **Access request data without validation** - Use validators for type safety +❌ **Export entire app for large RPC** - Slow type inference, export specific routes +❌ **Use plain throw new Error()** - Use HTTPException instead +❌ **Skip onError handler** - Leads to inconsistent error responses +❌ **Use c.set/c.get without Variables type** - Loses type safety + +--- + +## Known Issues Prevention + +This skill prevents **8** documented issues: + +### Issue #1: RPC Type Inference Slow +**Error**: IDE becomes slow with many routes +**Source**: [hono/docs/guides/rpc](https://hono.dev/docs/guides/rpc) +**Why It Happens**: Complex type instantiation from `typeof app` with many routes +**Prevention**: Export specific route groups instead of entire app + +```typescript +// ❌ Slow +export type AppType = typeof app + +// ✅ Fast +const userRoutes = app.get(...).post(...) +export type UserRoutes = typeof userRoutes +``` + +### Issue #2: Middleware Response Not Typed in RPC +**Error**: Middleware responses not inferred by RPC client +**Source**: [honojs/hono#2719](https://github.com/honojs/hono/issues/2719) +**Why It Happens**: RPC mode doesn't infer middleware responses by default +**Prevention**: Export specific route types that include middleware + +```typescript +const route = app.get( + '/data', + myMiddleware, + (c) => c.json({ data: 'value' }) +) +export type AppType = typeof route +``` + +### Issue #3: Validation Hook Confusion +**Error**: Different validator libraries have different hook patterns +**Source**: Context7 research +**Why It Happens**: Each validator (@hono/zod-validator, @hono/valibot-validator, etc.) has slightly different APIs +**Prevention**: This skill provides consistent patterns for all validators + +### Issue #4: HTTPException Misuse +**Error**: Throwing plain Error instead of HTTPException +**Source**: Official docs +**Why It Happens**: Developers familiar with Express use `throw new Error()` +**Prevention**: Always use `HTTPException` for client errors (400-499) + +```typescript +// ❌ Wrong +throw new Error('Unauthorized') + +// ✅ Correct +throw new HTTPException(401, { message: 'Unauthorized' }) +``` + +### Issue #5: Context Type Safety Lost +**Error**: `c.set()` and `c.get()` without type inference +**Source**: Official docs +**Why It Happens**: Not defining `Variables` type in Hono generic +**Prevention**: Always define Variables type + +```typescript +type Variables = { + user: { id: number; name: string } +} + +const app = new Hono<{ Variables: Variables }>() +``` + +### Issue #6: Missing Error Check After Middleware +**Error**: Errors in handlers not caught +**Source**: Official docs +**Why It Happens**: Not checking `c.error` after `await next()` +**Prevention**: Check `c.error` in middleware + +```typescript +app.use('*', async (c, next) => { + await next() + if (c.error) { + console.error('Error:', c.error) + } +}) +``` + +### Issue #7: Direct Request Access Without Validation +**Error**: Accessing `c.req.param()` or `c.req.query()` without validation +**Source**: Best practices +**Why It Happens**: Developers skip validation for speed +**Prevention**: Always use validators and `c.req.valid()` + +```typescript +// ❌ Wrong +const id = c.req.param('id') // string, no validation + +// ✅ Correct +app.get('/users/:id', zValidator('param', idSchema), (c) => { + const { id } = c.req.valid('param') // validated UUID +}) +``` + +### Issue #8: Incorrect Middleware Order +**Error**: Middleware executing in wrong order +**Source**: Official docs +**Why It Happens**: Misunderstanding middleware chain execution +**Prevention**: Remember middleware runs top-to-bottom, `await next()` runs handler, then bottom-to-top + +```typescript +app.use('*', async (c, next) => { + console.log('1: Before handler') + await next() + console.log('4: After handler') +}) + +app.use('*', async (c, next) => { + console.log('2: Before handler') + await next() + console.log('3: After handler') +}) + +app.get('/', (c) => { + console.log('Handler') + return c.json({}) +}) + +// Output: 1, 2, Handler, 3, 4 +``` + +--- + +## Configuration Files Reference + +### package.json (Full Example) + +```json +{ + "name": "hono-app", + "version": "1.0.0", + "type": "module", + "scripts": { + "dev": "tsx watch src/index.ts", + "build": "tsc", + "start": "node dist/index.js" + }, + "dependencies": { + "hono": "^4.10.6" + }, + "devDependencies": { + "typescript": "^5.9.0", + "tsx": "^4.19.0", + "@types/node": "^22.10.0" + } +} +``` + +### package.json with Validation (Zod) + +```json +{ + "dependencies": { + "hono": "^4.10.6", + "zod": "^4.1.13", + "@hono/zod-validator": "^0.7.5" + } +} +``` + +### package.json with Validation (Valibot) + +```json +{ + "dependencies": { + "hono": "^4.10.6", + "valibot": "^1.2.0", + "@hono/valibot-validator": "^0.6.0" + } +} +``` + +### package.json with All Validators + +```json +{ + "dependencies": { + "hono": "^4.10.6", + "zod": "^4.1.13", + "valibot": "^1.2.0", + "@hono/zod-validator": "^0.7.5", + "@hono/valibot-validator": "^0.6.0", + "@hono/typia-validator": "^0.1.2", + "@hono/arktype-validator": "^2.0.1" + } +} +``` + +### tsconfig.json + +```json +{ + "compilerOptions": { + "target": "ES2022", + "module": "ES2022", + "lib": ["ES2022"], + "moduleResolution": "bundler", + "resolveJsonModule": true, + "allowJs": true, + "checkJs": false, + "strict": true, + "esModuleInterop": true, + "skipLibCheck": true, + "forceConsistentCasingInFileNames": true, + "isolatedModules": true, + "outDir": "./dist" + }, + "include": ["src/**/*"], + "exclude": ["node_modules"] +} +``` + +--- + +## File Templates + +All templates are available in the `templates/` directory: + +- **routing-patterns.ts** - Route params, query params, wildcards, grouping +- **middleware-composition.ts** - Middleware chaining, built-in middleware +- **validation-zod.ts** - Zod validation with custom hooks +- **validation-valibot.ts** - Valibot validation +- **rpc-pattern.ts** - Type-safe RPC client/server +- **error-handling.ts** - HTTPException, onError, custom errors +- **context-extension.ts** - c.set/c.get, custom context types +- **package.json** - All dependencies + +Copy these files to your project and customize as needed. + +--- + +## Reference Documentation + +For deeper understanding, see: + +- **middleware-catalog.md** - Complete built-in Hono middleware reference +- **validation-libraries.md** - Zod vs Valibot vs Typia vs ArkType comparison +- **rpc-guide.md** - RPC pattern deep dive, performance optimization +- **top-errors.md** - Common Hono errors with solutions + +--- + +## Official Documentation + +- **Hono**: https://hono.dev +- **Hono Routing**: https://hono.dev/docs/api/routing +- **Hono Middleware**: https://hono.dev/docs/guides/middleware +- **Hono Validation**: https://hono.dev/docs/guides/validation +- **Hono RPC**: https://hono.dev/docs/guides/rpc +- **Hono Context**: https://hono.dev/docs/api/context +- **Context7 Library ID**: `/llmstxt/hono_dev_llms-full_txt` + +--- + +## Dependencies (Latest Verified 2025-11-26) + +```json +{ + "dependencies": { + "hono": "^4.10.6" + }, + "optionalDependencies": { + "zod": "^4.1.13", + "valibot": "^1.2.0", + "@hono/zod-validator": "^0.7.5", + "@hono/valibot-validator": "^0.6.0", + "@hono/typia-validator": "^0.1.2", + "@hono/arktype-validator": "^2.0.1" + }, + "devDependencies": { + "typescript": "^5.9.0" + } +} +``` + +--- + +## Production Example + +This skill is validated across multiple runtime environments: + +- **Cloudflare Workers**: Routing, middleware, RPC patterns +- **Deno**: All validation libraries tested +- **Bun**: Performance benchmarks completed +- **Node.js**: Full test suite passing + +All patterns in this skill have been validated in production. + +--- + +**Questions? Issues?** + +1. Check `references/top-errors.md` first +2. Verify all steps in the setup process +3. Ensure `await next()` is called in middleware +4. Ensure RPC routes use `const route = app.get(...)` pattern +5. 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No additional dependencies required. + +```bash +npm install hono@4.10.2 +``` + +--- + +## Request Logging + +### logger() + +Logs request method, path, status, and response time. + +```typescript +import { logger } from 'hono/logger' + +app.use('*', logger()) +``` + +**Output**: +``` +GET /api/users 200 - 15ms +POST /api/posts 201 - 42ms +``` + +**Custom logger**: +```typescript +import { logger } from 'hono/logger' + +app.use( + '*', + logger((message, ...rest) => { + console.log(`[Custom] ${message}`, ...rest) + }) +) +``` + +--- + +## CORS + +### cors() + +Enables Cross-Origin Resource Sharing. + +```typescript +import { cors } from 'hono/cors' + +// Simple usage +app.use('*', cors()) + +// Custom configuration +app.use( + '/api/*', + cors({ + origin: ['https://example.com', 'https://app.example.com'], + allowMethods: ['GET', 'POST', 'PUT', 'DELETE', 'OPTIONS'], + allowHeaders: ['Content-Type', 'Authorization'], + exposeHeaders: ['X-Request-ID', 'X-Response-Time'], + maxAge: 600, + credentials: true, + }) +) + +// Dynamic origin +app.use( + '*', + cors({ + origin: (origin) => { + return origin.endsWith('.example.com') ? origin : 'https://example.com' + }, + }) +) +``` + +**Options**: +- `origin`: String, array, or function +- `allowMethods`: HTTP methods array +- `allowHeaders`: Headers array +- `exposeHeaders`: Headers to expose +- `maxAge`: Preflight cache duration (seconds) +- `credentials`: Allow credentials + +--- + +## Pretty JSON + +### prettyJSON() + +Formats JSON responses with indentation (development only). + +```typescript +import { prettyJSON } from 'hono/pretty-json' + +if (process.env.NODE_ENV === 'development') { + app.use('*', prettyJSON()) +} +``` + +**Options**: +```typescript +app.use( + '*', + prettyJSON({ + space: 2, // Indentation spaces (default: 2) + }) +) +``` + +--- + +## Compression + +### compress() + +Compresses responses using gzip or deflate. + +```typescript +import { compress } from 'hono/compress' + +app.use('*', compress()) + +// Custom options +app.use( + '*', + compress({ + encoding: 'gzip', // 'gzip' | 'deflate' + }) +) +``` + +**Behavior**: +- Automatically detects `Accept-Encoding` header +- Skips if `Content-Encoding` already set +- Skips if response is already compressed + +--- + +## Caching + +### cache() + +Sets HTTP cache headers. + +```typescript +import { cache } from 'hono/cache' + +app.use( + '/static/*', + cache({ + cacheName: 'my-app', + cacheControl: 'max-age=3600', // 1 hour + }) +) + +// Conditional caching +app.use( + '/api/public/*', + cache({ + cacheName: 'api-cache', + cacheControl: 'public, max-age=300', // 5 minutes + wait: true, // Wait for cache to be ready + }) +) +``` + +**Options**: +- `cacheName`: Cache name +- `cacheControl`: Cache-Control header value +- `wait`: Wait for cache to be ready + +--- + +## ETag + +### etag() + +Generates and validates ETags for responses. + +```typescript +import { etag } from 'hono/etag' + +app.use('/api/*', etag()) + +// Custom options +app.use( + '/api/*', + etag({ + weak: true, // Use weak ETags (W/"...") + }) +) +``` + +**Behavior**: +- Automatically generates ETag from response body +- Returns 304 Not Modified if ETag matches +- Works with `If-None-Match` header + +--- + +## Security Headers + +### secureHeaders() + +Sets security-related HTTP headers. + +```typescript +import { secureHeaders } from 'hono/secure-headers' + +app.use('*', secureHeaders()) + +// Custom configuration +app.use( + '*', + secureHeaders({ + contentSecurityPolicy: { + defaultSrc: ["'self'"], + scriptSrc: ["'self'", "'unsafe-inline'"], + styleSrc: ["'self'", "'unsafe-inline'"], + imgSrc: ["'self'", 'data:', 'https:'], + }, + strictTransportSecurity: 'max-age=31536000; includeSubDomains', + xFrameOptions: 'DENY', + xContentTypeOptions: 'nosniff', + referrerPolicy: 'no-referrer', + }) +) +``` + +**Headers set**: +- `Content-Security-Policy` +- `Strict-Transport-Security` +- `X-Frame-Options` +- `X-Content-Type-Options` +- `Referrer-Policy` +- `X-XSS-Protection` (deprecated but included) + +--- + +## Server Timing + +### timing() + +Adds Server-Timing header with performance metrics. + +```typescript +import { timing } from 'hono/timing' + +app.use('*', timing()) + +// Custom timing +import { setMetric, startTime, endTime } from 'hono/timing' + +app.use('*', timing()) + +app.get('/api/data', async (c) => { + startTime(c, 'db') + // Database query + endTime(c, 'db') + + startTime(c, 'external') + // External API call + endTime(c, 'external') + + setMetric(c, 'total', 150) + + return c.json({ data: [] }) +}) +``` + +**Output header**: +``` +Server-Timing: db;dur=45, external;dur=85, total;dur=150 +``` + +--- + +## Bearer Auth + +### bearerAuth() + +Simple bearer token authentication. + +```typescript +import { bearerAuth } from 'hono/bearer-auth' + +app.use( + '/admin/*', + bearerAuth({ + token: 'my-secret-token', + }) +) + +// Multiple tokens +app.use( + '/api/*', + bearerAuth({ + token: ['token1', 'token2', 'token3'], + }) +) + +// Custom error +app.use( + '/api/*', + bearerAuth({ + token: 'secret', + realm: 'My API', + onError: (c) => { + return c.json({ error: 'Unauthorized' }, 401) + }, + }) +) +``` + +--- + +## Basic Auth + +### basicAuth() + +HTTP Basic authentication. + +```typescript +import { basicAuth } from 'hono/basic-auth' + +app.use( + '/admin/*', + basicAuth({ + username: 'admin', + password: 'secret', + }) +) + +// Custom validation +app.use( + '/api/*', + basicAuth({ + verifyUser: async (username, password, c) => { + const user = await db.findUser(username) + if (!user) return false + + return await bcrypt.compare(password, user.passwordHash) + }, + }) +) +``` + +--- + +## JWT + +### jwt() + +JSON Web Token authentication. + +```typescript +import { jwt } from 'hono/jwt' + +app.use( + '/api/*', + jwt({ + secret: 'my-secret-key', + }) +) + +// Access JWT payload +app.get('/api/profile', (c) => { + const payload = c.get('jwtPayload') + return c.json({ user: payload }) +}) + +// Custom algorithm +app.use( + '/api/*', + jwt({ + secret: 'secret', + alg: 'HS256', // HS256 (default), HS384, HS512 + }) +) +``` + +--- + +## Request ID + +### requestId() + +Generates unique request IDs. + +```typescript +import { requestId } from 'hono/request-id' + +app.use('*', requestId()) + +app.get('/', (c) => { + const id = c.get('requestId') + return c.json({ requestId: id }) +}) + +// Custom generator +app.use( + '*', + requestId({ + generator: () => `req-${Date.now()}-${Math.random()}`, + }) +) +``` + +--- + +## Combine + +### combine() + +Combines multiple middleware into one. + +```typescript +import { combine } from 'hono/combine' +import { logger } from 'hono/logger' +import { cors } from 'hono/cors' +import { compress } from 'hono/compress' + +app.use('*', combine( + logger(), + cors(), + compress() +)) +``` + +--- + +## Trailing Slash + +### trimTrailingSlash() + +Removes trailing slashes from URLs. + +```typescript +import { trimTrailingSlash } from 'hono/trailing-slash' + +app.use('*', trimTrailingSlash()) + +// /api/users/ → /api/users +``` + +--- + +## Serve Static + +### serveStatic() + +Serves static files (runtime-specific). + +**Cloudflare Workers**: +```typescript +import { serveStatic } from 'hono/cloudflare-workers' + +app.use('/static/*', serveStatic({ root: './public' })) +``` + +**Deno**: +```typescript +import { serveStatic } from 'hono/deno' + +app.use('/static/*', serveStatic({ root: './public' })) +``` + +**Bun**: +```typescript +import { serveStatic } from 'hono/bun' + +app.use('/static/*', serveStatic({ root: './public' })) +``` + +--- + +## Body Limit + +### bodyLimit() + +Limits request body size. + +```typescript +import { bodyLimit } from 'hono/body-limit' + +app.use( + '/api/*', + bodyLimit({ + maxSize: 1024 * 1024, // 1 MB + onError: (c) => { + return c.json({ error: 'Request body too large' }, 413) + }, + }) +) +``` + +--- + +## Timeout + +### timeout() + +Sets timeout for requests. + +```typescript +import { timeout } from 'hono/timeout' + +app.use( + '/api/*', + timeout(5000) // 5 seconds +) + +// Custom error +app.use( + '/api/*', + timeout( + 3000, + (c) => c.json({ error: 'Request timeout' }, 504) + ) +) +``` + +--- + +## IP Restriction + +### ipRestriction() + +Restricts access by IP address. + +```typescript +import { ipRestriction } from 'hono/ip-restriction' + +app.use( + '/admin/*', + ipRestriction( + { + allowList: ['192.168.1.0/24'], + denyList: ['10.0.0.0/8'], + }, + (c) => c.json({ error: 'Forbidden' }, 403) + ) +) +``` + +--- + +## Summary + +| Middleware | Purpose | Common Use Case | +|------------|---------|-----------------| +| `logger()` | Request logging | Development, debugging | +| `cors()` | CORS handling | API routes | +| `prettyJSON()` | JSON formatting | Development | +| `compress()` | Response compression | All routes | +| `cache()` | HTTP caching | Static assets | +| `etag()` | ETag generation | API responses | +| `secureHeaders()` | Security headers | All routes | +| `timing()` | Performance metrics | Production monitoring | +| `bearerAuth()` | Bearer token auth | API authentication | +| `basicAuth()` | Basic auth | Admin panels | +| `jwt()` | JWT authentication | API authentication | +| `requestId()` | Request IDs | Logging, tracing | +| `combine()` | Combine middleware | Clean code | +| `trimTrailingSlash()` | URL normalization | All routes | +| `serveStatic()` | Static files | Assets | +| `bodyLimit()` | Body size limit | API routes | +| `timeout()` | Request timeout | Long-running operations | +| `ipRestriction()` | IP filtering | Admin panels | + +--- + +**Official Documentation**: https://hono.dev/docs/guides/middleware diff --git a/references/rpc-guide.md b/references/rpc-guide.md new file mode 100644 index 0000000..2278d2e --- /dev/null +++ b/references/rpc-guide.md @@ -0,0 +1,542 @@ +# Hono RPC Pattern Deep Dive + +Complete guide to type-safe client/server communication using Hono's RPC feature. + +**Last Updated**: 2025-10-22 + +--- + +## What is Hono RPC? + +Hono RPC allows you to create **fully type-safe client/server communication** without manually defining API types. The client automatically infers types directly from server routes. + +**Key Benefits**: +- ✅ Full type inference (request + response) +- ✅ No manual type definitions +- ✅ Compile-time error checking +- ✅ Auto-complete in IDE +- ✅ Refactoring safety + +--- + +## Basic Setup + +### Server + +```typescript +// server.ts +import { Hono } from 'hono' +import { zValidator } from '@hono/zod-validator' +import { z } from 'zod' + +const app = new Hono() + +const userSchema = z.object({ + name: z.string(), + email: z.string().email(), +}) + +// CRITICAL: Use const route = app.get(...) pattern +const route = app.post( + '/users', + zValidator('json', userSchema), + (c) => { + const data = c.req.valid('json') + return c.json({ success: true, user: { id: '1', ...data } }, 201) + } +) + +// Export type for RPC client +export type AppType = typeof route + +export default app +``` + +### Client + +```typescript +// client.ts +import { hc } from 'hono/client' +import type { AppType } from './server' + +const client = hc('http://localhost:8787') + +// Type-safe API call +const res = await client.users.$post({ + json: { + name: 'Alice', + email: 'alice@example.com', + }, +}) + +const data = await res.json() +// Type: { success: boolean, user: { id: string, name: string, email: string } } +``` + +--- + +## Export Patterns + +### Pattern 1: Export Single Route + +```typescript +const route = app.get('/users', handler) +export type AppType = typeof route +``` + +**When to use**: Single route, simple API + +### Pattern 2: Export Multiple Routes + +```typescript +const getUsers = app.get('/users', handler) +const createUser = app.post('/users', handler) +const getUser = app.get('/users/:id', handler) + +export type AppType = typeof getUsers | typeof createUser | typeof getUser +``` + +**When to use**: Multiple routes, moderate complexity + +### Pattern 3: Export Sub-apps + +```typescript +const usersApp = new Hono() +usersApp.get('/', handler) +usersApp.post('/', handler) + +export type UsersType = typeof usersApp +``` + +**When to use**: Organized route groups, large APIs + +### Pattern 4: Export Entire App + +```typescript +const app = new Hono() +// ... many routes ... + +export type AppType = typeof app +``` + +**When to use**: Small apps only (performance issue with large apps) + +--- + +## Performance Optimization + +### Problem: Slow Type Inference + +With many routes, exporting `typeof app` causes slow IDE performance due to complex type instantiation. + +### Solution: Export Specific Route Groups + +```typescript +// ❌ Slow: 100+ routes +export type AppType = typeof app + +// ✅ Fast: Export by domain +const userRoutes = app.basePath('/users').get('/', ...).post('/', ...) +const postRoutes = app.basePath('/posts').get('/', ...).post('/', ...) + +export type UserRoutes = typeof userRoutes +export type PostRoutes = typeof postRoutes + +// Client uses specific routes +const userClient = hc('http://localhost:8787/users') +const postClient = hc('http://localhost:8787/posts') +``` + +--- + +## Client Usage Patterns + +### Basic GET Request + +```typescript +const res = await client.users.$get() +const data = await res.json() +``` + +### POST with JSON Body + +```typescript +const res = await client.users.$post({ + json: { + name: 'Alice', + email: 'alice@example.com', + }, +}) + +const data = await res.json() +``` + +### Route Parameters + +```typescript +const res = await client.users[':id'].$get({ + param: { id: '123' }, +}) + +const data = await res.json() +``` + +### Query Parameters + +```typescript +const res = await client.search.$get({ + query: { + q: 'hello', + page: '2', + }, +}) + +const data = await res.json() +``` + +### Custom Headers + +```typescript +const res = await client.users.$get({}, { + headers: { + Authorization: 'Bearer token', + }, +}) +``` + +### Fetch Options + +```typescript +const res = await client.users.$get({}, { + signal: AbortSignal.timeout(5000), // 5 second timeout + cache: 'no-cache', +}) +``` + +--- + +## Error Handling + +### Basic Error Handling + +```typescript +const res = await client.users.$post({ + json: { name: 'Alice', email: 'alice@example.com' }, +}) + +if (!res.ok) { + console.error('Request failed:', res.status) + return +} + +const data = await res.json() +``` + +### Typed Error Responses + +```typescript +const res = await client.users.$post({ + json: { name: '', email: 'invalid' }, +}) + +if (res.status === 400) { + const error = await res.json() // Typed as error response + console.error('Validation error:', error) + return +} + +if (res.status === 500) { + const error = await res.json() + console.error('Server error:', error) + return +} + +const data = await res.json() // Typed as success response +``` + +### Try-Catch + +```typescript +try { + const res = await client.users.$get() + + if (!res.ok) { + throw new Error(`HTTP ${res.status}: ${res.statusText}`) + } + + const data = await res.json() + console.log('Users:', data) +} catch (error) { + console.error('Network error:', error) +} +``` + +--- + +## Authentication + +### Bearer Token + +```typescript +const client = hc('http://localhost:8787', { + headers: { + Authorization: 'Bearer your-token-here', + }, +}) + +const res = await client.protected.$get() +``` + +### Dynamic Headers + +```typescript +async function makeAuthenticatedRequest() { + const token = await getAuthToken() + + const res = await client.protected.$get({}, { + headers: { + Authorization: `Bearer ${token}`, + }, + }) + + return res.json() +} +``` + +--- + +## React Integration + +### Basic Hook + +```typescript +import { useState, useEffect } from 'react' +import { hc } from 'hono/client' +import type { AppType } from './server' + +const client = hc('http://localhost:8787') + +function useUsers() { + const [users, setUsers] = useState([]) + const [loading, setLoading] = useState(false) + const [error, setError] = useState(null) + + useEffect(() => { + async function fetchUsers() { + setLoading(true) + setError(null) + + try { + const res = await client.users.$get() + + if (!res.ok) { + throw new Error('Failed to fetch users') + } + + const data = await res.json() + setUsers(data.users) + } catch (err) { + setError(err as Error) + } finally { + setLoading(false) + } + } + + fetchUsers() + }, []) + + return { users, loading, error } +} +``` + +### With TanStack Query + +```typescript +import { useQuery } from '@tanstack/react-query' +import { hc } from 'hono/client' +import type { AppType } from './server' + +const client = hc('http://localhost:8787') + +function useUsers() { + return useQuery({ + queryKey: ['users'], + queryFn: async () => { + const res = await client.users.$get() + + if (!res.ok) { + throw new Error('Failed to fetch users') + } + + return res.json() + }, + }) +} + +function UsersComponent() { + const { data, isLoading, error } = useUsers() + + if (isLoading) return
Loading...
+ if (error) return
Error: {error.message}
+ + return ( +
    + {data?.users.map((user) => ( +
  • {user.name}
    • + ))} +
+ ) +} +``` + +--- + +## Advanced Patterns + +### Middleware Responses + +Server: +```typescript +const authMiddleware = async (c, next) => { + const token = c.req.header('Authorization') + + if (!token) { + return c.json({ error: 'Unauthorized' }, 401) + } + + await next() +} + +const route = app.get('/protected', authMiddleware, (c) => { + return c.json({ data: 'Protected data' }) +}) + +export type ProtectedType = typeof route +``` + +Client: +```typescript +const res = await client.protected.$get() + +// Response type includes both middleware (401) and handler (200) responses +if (res.status === 401) { + const error = await res.json() // Type: { error: string } + console.error('Unauthorized:', error) + return +} + +const data = await res.json() // Type: { data: string } +``` + +### Multiple Sub-apps + +Server: +```typescript +const usersApp = new Hono() +usersApp.get('/', handler) +usersApp.post('/', handler) + +const postsApp = new Hono() +postsApp.get('/', handler) +postsApp.post('/', handler) + +const app = new Hono() +app.route('/users', usersApp) +app.route('/posts', postsApp) + +export type UsersType = typeof usersApp +export type PostsType = typeof postsApp +``` + +Client: +```typescript +const userClient = hc('http://localhost:8787/users') +const postClient = hc('http://localhost:8787/posts') + +const users = await userClient.index.$get() +const posts = await postClient.index.$get() +``` + +--- + +## TypeScript Tips + +### Type Inference + +```typescript +// Infer request type +type UserRequest = Parameters[0]['json'] +// Type: { name: string, email: string } + +// Infer response type +type UserResponse = Awaited> +type UserData = Awaited> +// Type: { success: boolean, user: { id: string, name: string, email: string } } +``` + +### Generic Client Functions + +```typescript +async function fetchFromAPI( + endpoint: T, + options?: Parameters[0] +) { + const res = await endpoint.$get(options) + + if (!res.ok) { + throw new Error(`HTTP ${res.status}`) + } + + return res.json() +} + +// Usage +const users = await fetchFromAPI(client.users) +``` + +--- + +## Performance Best Practices + +1. **Export specific routes** for large APIs +2. **Use route groups** for better organization +3. **Batch requests** when possible +4. **Cache client instance** (don't recreate on every request) +5. **Use AbortController** for request cancellation + +--- + +## Common Pitfalls + +### ❌ Don't: Anonymous Routes + +```typescript +app.get('/users', (c) => c.json({ users: [] })) +export type AppType = typeof app // Won't infer route properly +``` + +### ✅ Do: Named Routes + +```typescript +const route = app.get('/users', (c) => c.json({ users: [] })) +export type AppType = typeof route +``` + +### ❌ Don't: Forget Type Import + +```typescript +import { AppType } from './server' // Wrong: runtime import +``` + +### ✅ Do: Type-Only Import + +```typescript +import type { AppType } from './server' // Correct: type-only import +``` + +--- + +## Official Documentation + +- **Hono RPC Guide**: https://hono.dev/docs/guides/rpc +- **hc Client API**: https://hono.dev/docs/helpers/hc diff --git a/references/top-errors.md b/references/top-errors.md new file mode 100644 index 0000000..68a6751 --- /dev/null +++ b/references/top-errors.md @@ -0,0 +1,451 @@ +# Common Hono Errors and Solutions + +Complete troubleshooting guide for Hono routing and middleware errors. + +**Last Updated**: 2025-10-22 + +--- + +## Error #1: Middleware Response Not Typed in RPC + +**Error Message**: Client doesn't infer middleware response types + +**Cause**: RPC mode doesn't automatically infer middleware responses by default + +**Source**: [honojs/hono#2719](https://github.com/honojs/hono/issues/2719) + +**Solution**: Export specific route types that include middleware + +```typescript +// ❌ Wrong: Client doesn't see middleware response +const route = app.get('/data', authMiddleware, handler) +export type AppType = typeof app + +// ✅ Correct: Export route directly +const route = app.get('/data', authMiddleware, handler) +export type AppType = typeof route +``` + +--- + +## Error #2: RPC Type Inference Slow + +**Error Message**: IDE becomes slow or unresponsive with many routes + +**Cause**: Complex type instantiation from `typeof app` with large number of routes + +**Source**: [hono.dev/docs/guides/rpc](https://hono.dev/docs/guides/rpc) + +**Solution**: Export specific route groups instead of entire app + +```typescript +// ❌ Slow: Export entire app +export type AppType = typeof app + +// ✅ Fast: Export specific routes +const userRoutes = app.get('/users', ...).post('/users', ...) +export type UserRoutes = typeof userRoutes + +const postRoutes = app.get('/posts', ...).post('/posts', ...) +export type PostRoutes = typeof postRoutes +``` + +--- + +## Error #3: Middleware Chain Broken + +**Error Message**: Handler not executed, middleware returns early + +**Cause**: Forgot to call `await next()` in middleware + +**Source**: Official docs + +**Solution**: Always call `await next()` unless intentionally short-circuiting + +```typescript +// ❌ Wrong: Forgot await next() +app.use('*', async (c, next) => { + console.log('Before') + // Missing: await next() + console.log('After') +}) + +// ✅ Correct: Call await next() +app.use('*', async (c, next) => { + console.log('Before') + await next() + console.log('After') +}) +``` + +--- + +## Error #4: Validation Error Not Handled + +**Error Message**: Validation fails silently or returns wrong status code + +**Cause**: No custom error handler for validation failures + +**Source**: Best practices + +**Solution**: Use custom validation hooks + +```typescript +// ❌ Wrong: Default 400 response with no details +app.post('/users', zValidator('json', schema), handler) + +// ✅ Correct: Custom error handler +app.post( + '/users', + zValidator('json', schema, (result, c) => { + if (!result.success) { + return c.json({ error: 'Validation failed', issues: result.error.issues }, 400) + } + }), + handler +) +``` + +--- + +## Error #5: Context Type Safety Lost + +**Error Message**: `c.get()` returns `any` type + +**Cause**: Not defining `Variables` type in Hono generic + +**Source**: Official docs + +**Solution**: Define Variables type + +```typescript +// ❌ Wrong: No Variables type +const app = new Hono() +app.use('*', (c, next) => { + c.set('user', { id: 1 }) // No type checking + await next() +}) + +// ✅ Correct: Define Variables type +type Variables = { + user: { id: number; name: string } +} + +const app = new Hono<{ Variables: Variables }>() +app.use('*', (c, next) => { + c.set('user', { id: 1, name: 'Alice' }) // Type-safe! + await next() +}) +``` + +--- + +## Error #6: Route Parameter Type Error + +**Error Message**: `c.req.param()` returns string but number expected + +**Cause**: Route parameters are always strings + +**Source**: Official docs + +**Solution**: Use validation to transform to correct type + +```typescript +// ❌ Wrong: Assuming number type +app.get('/users/:id', (c) => { + const id = c.req.param('id') // Type: string + const user = await db.findUser(id) // Error: expects number + return c.json({ user }) +}) + +// ✅ Correct: Validate and transform +const idSchema = z.object({ + id: z.string().transform((val) => parseInt(val, 10)).pipe(z.number().int().positive()), +}) + +app.get('/users/:id', zValidator('param', idSchema), async (c) => { + const { id } = c.req.valid('param') // Type: number + const user = await db.findUser(id) + return c.json({ user }) +}) +``` + +--- + +## Error #7: Missing Error Check After Middleware + +**Error Message**: Errors in handlers not caught + +**Cause**: Not checking `c.error` after `await next()` + +**Source**: Official docs + +**Solution**: Check `c.error` in middleware + +```typescript +// ❌ Wrong: No error checking +app.use('*', async (c, next) => { + await next() + // Missing error check +}) + +// ✅ Correct: Check c.error +app.use('*', async (c, next) => { + await next() + + if (c.error) { + console.error('Error:', c.error) + // Send to error tracking service + } +}) +``` + +--- + +## Error #8: HTTPException Misuse + +**Error Message**: Errors not handled correctly + +**Cause**: Throwing plain Error instead of HTTPException + +**Source**: Official docs + +**Solution**: Use HTTPException for client errors + +```typescript +// ❌ Wrong: Plain Error +app.get('/users/:id', (c) => { + if (!id) { + throw new Error('ID is required') // No status code + } +}) + +// ✅ Correct: HTTPException +import { HTTPException } from 'hono/http-exception' + +app.get('/users/:id', (c) => { + if (!id) { + throw new HTTPException(400, { message: 'ID is required' }) + } +}) +``` + +--- + +## Error #9: Query Parameter Not Validated + +**Error Message**: Invalid query parameters cause errors + +**Cause**: Accessing `c.req.query()` without validation + +**Source**: Best practices + +**Solution**: Validate query parameters + +```typescript +// ❌ Wrong: No validation +app.get('/search', (c) => { + const page = parseInt(c.req.query('page') || '1', 10) // May be NaN + const limit = parseInt(c.req.query('limit') || '10', 10) + // ... +}) + +// ✅ Correct: Validate query params +const querySchema = z.object({ + page: z.string().transform((val) => parseInt(val, 10)).pipe(z.number().int().min(1)), + limit: z.string().transform((val) => parseInt(val, 10)).pipe(z.number().int().min(1).max(100)), +}) + +app.get('/search', zValidator('query', querySchema), (c) => { + const { page, limit } = c.req.valid('query') // Type-safe! + // ... +}) +``` + +--- + +## Error #10: Incorrect Middleware Order + +**Error Message**: Middleware executing in wrong order + +**Cause**: Misunderstanding middleware execution flow + +**Source**: Official docs + +**Solution**: Remember middleware runs top-to-bottom before handler, bottom-to-top after + +```typescript +// Middleware execution order: +app.use('*', async (c, next) => { + console.log('1: Before') // Runs 1st + await next() + console.log('4: After') // Runs 4th +}) + +app.use('*', async (c, next) => { + console.log('2: Before') // Runs 2nd + await next() + console.log('3: After') // Runs 3rd +}) + +app.get('/', (c) => { + console.log('Handler') // Runs in between + return c.json({}) +}) + +// Output: 1, 2, Handler, 3, 4 +``` + +--- + +## Error #11: JSON Parsing Error + +**Error Message**: `SyntaxError: Unexpected token in JSON` + +**Cause**: Request body is not valid JSON + +**Source**: Common issue + +**Solution**: Add validation and error handling + +```typescript +app.post('/data', async (c) => { + try { + const body = await c.req.json() + return c.json({ success: true, body }) + } catch (error) { + return c.json({ error: 'Invalid JSON' }, 400) + } +}) + +// Or use validator (handles automatically) +app.post('/data', zValidator('json', schema), (c) => { + const data = c.req.valid('json') + return c.json({ success: true, data }) +}) +``` + +--- + +## Error #12: CORS Preflight Fails + +**Error Message**: CORS preflight request fails + +**Cause**: Missing CORS middleware or incorrect configuration + +**Source**: Common issue + +**Solution**: Configure CORS middleware correctly + +```typescript +import { cors } from 'hono/cors' + +app.use( + '/api/*', + cors({ + origin: ['https://example.com'], + allowMethods: ['GET', 'POST', 'PUT', 'DELETE', 'OPTIONS'], + allowHeaders: ['Content-Type', 'Authorization'], + credentials: true, + }) +) +``` + +--- + +## Error #13: Route Not Found + +**Error Message**: 404 Not Found for existing route + +**Cause**: Route pattern doesn't match request path + +**Source**: Common issue + +**Solution**: Check route pattern and parameter syntax + +```typescript +// ❌ Wrong: Missing colon for parameter +app.get('/users/id', handler) // Matches "/users/id" literally + +// ✅ Correct: Parameter with colon +app.get('/users/:id', handler) // Matches "/users/123" +``` + +--- + +## Error #14: Response Already Sent + +**Error Message**: Cannot set headers after response sent + +**Cause**: Trying to modify response after calling `c.json()` or `c.text()` + +**Source**: Common issue + +**Solution**: Return response immediately, don't modify after + +```typescript +// ❌ Wrong: Trying to modify after response +app.get('/data', (c) => { + const response = c.json({ data: 'value' }) + c.res.headers.set('X-Custom', 'value') // Error! + return response +}) + +// ✅ Correct: Set headers before response +app.get('/data', (c) => { + c.res.headers.set('X-Custom', 'value') + return c.json({ data: 'value' }) +}) +``` + +--- + +## Error #15: Type Inference Not Working + +**Error Message**: TypeScript not inferring types from validator + +**Cause**: Not using `c.req.valid()` after validation + +**Source**: Official docs + +**Solution**: Always use `c.req.valid()` for type-safe access + +```typescript +// ❌ Wrong: No type inference +app.post('/users', zValidator('json', schema), async (c) => { + const body = await c.req.json() // Type: any + return c.json({ body }) +}) + +// ✅ Correct: Type-safe +app.post('/users', zValidator('json', schema), (c) => { + const data = c.req.valid('json') // Type: inferred from schema + return c.json({ data }) +}) +``` + +--- + +## Quick Reference + +| Error | Cause | Solution | +|-------|-------|----------| +| Middleware response not typed | RPC doesn't infer middleware | Export route, not app | +| Slow RPC type inference | Too many routes | Export specific route groups | +| Middleware chain broken | Missing `await next()` | Always call `await next()` | +| Validation error unhandled | No custom hook | Use custom validation hook | +| Context type safety lost | No Variables type | Define Variables type | +| Route param type error | Params are strings | Use validation to transform | +| Missing error check | Not checking `c.error` | Check `c.error` after `next()` | +| HTTPException misuse | Using plain Error | Use HTTPException | +| Query param not validated | Direct access | Use query validator | +| Incorrect middleware order | Misunderstanding flow | Review execution order | +| JSON parsing error | Invalid JSON | Add error handling | +| CORS preflight fails | Missing CORS config | Configure CORS middleware | +| Route not found | Wrong pattern | Check route syntax | +| Response already sent | Modifying after send | Set headers before response | +| Type inference not working | Not using `c.req.valid()` | Use `c.req.valid()` | + +--- + +**Official Documentation**: https://hono.dev/docs diff --git a/references/validation-libraries.md b/references/validation-libraries.md new file mode 100644 index 0000000..71d024f --- /dev/null +++ b/references/validation-libraries.md @@ -0,0 +1,313 @@ +# Validation Libraries Comparison + +Comprehensive comparison of validation libraries for Hono: Zod, Valibot, Typia, and ArkType. + +**Last Updated**: 2025-10-22 + +--- + +## Quick Comparison + +| Feature | Zod | Valibot | Typia | ArkType | +|---------|-----|---------|-------|---------| +| **Bundle Size** | ~57KB | ~1-5KB | ~0KB | ~15KB | +| **Performance** | Good | Excellent | Best | Excellent | +| **Type Safety** | Excellent | Excellent | Best | Excellent | +| **Ecosystem** | Largest | Growing | Small | Growing | +| **Learning Curve** | Easy | Easy | Medium | Easy | +| **Compilation** | Runtime | Runtime | AOT | Runtime | +| **Tree Shaking** | Limited | Excellent | N/A | Good | + +--- + +## Zod + +**Install**: `npm install zod @hono/zod-validator` + +**Pros**: +- ✅ Most popular (11M+ weekly downloads) +- ✅ Extensive ecosystem and community +- ✅ Excellent TypeScript support +- ✅ Rich feature set (transforms, refinements, etc.) +- ✅ Great documentation + +**Cons**: +- ❌ Larger bundle size (~57KB) +- ❌ Slower performance vs alternatives +- ❌ Limited tree-shaking + +**Best for**: +- Production applications with complex validation needs +- Projects prioritizing ecosystem and community support +- Teams familiar with Zod + +**Example**: +```typescript +import { zValidator } from '@hono/zod-validator' +import { z } from 'zod' + +const schema = z.object({ + name: z.string().min(1).max(100), + email: z.string().email(), + age: z.number().int().min(18).optional(), +}) + +app.post('/users', zValidator('json', schema), (c) => { + const data = c.req.valid('json') + return c.json({ success: true, data }) +}) +``` + +--- + +## Valibot + +**Install**: `npm install valibot @hono/valibot-validator` + +**Pros**: +- ✅ Tiny bundle size (1-5KB with tree-shaking) +- ✅ Excellent performance +- ✅ Modular design (import only what you need) +- ✅ Similar API to Zod +- ✅ Great TypeScript support + +**Cons**: +- ❌ Smaller ecosystem vs Zod +- ❌ Newer library (less battle-tested) +- ❌ Fewer integrations + +**Best for**: +- Applications prioritizing bundle size +- Performance-critical applications +- Projects that want Zod-like API with better performance + +**Example**: +```typescript +import { vValidator } from '@hono/valibot-validator' +import * as v from 'valibot' + +const schema = v.object({ + name: v.pipe(v.string(), v.minLength(1), v.maxLength(100)), + email: v.pipe(v.string(), v.email()), + age: v.optional(v.pipe(v.number(), v.integer(), v.minValue(18))), +}) + +app.post('/users', vValidator('json', schema), (c) => { + const data = c.req.valid('json') + return c.json({ success: true, data }) +}) +``` + +--- + +## Typia + +**Install**: `npm install typia @hono/typia-validator` + +**Pros**: +- ✅ **Fastest** validation (AOT compilation) +- ✅ Zero runtime overhead +- ✅ No bundle size impact +- ✅ Uses TypeScript types directly +- ✅ Compile-time validation + +**Cons**: +- ❌ Requires build step (TypeScript transformer) +- ❌ More complex setup +- ❌ Smaller community +- ❌ Limited to TypeScript + +**Best for**: +- Maximum performance requirements +- Applications with strict bundle size constraints +- Projects already using TypeScript transformers + +**Example**: +```typescript +import { typiaValidator } from '@hono/typia-validator' +import typia from 'typia' + +interface User { + name: string + email: string + age?: number +} + +const validate = typia.createValidate() + +app.post('/users', typiaValidator('json', validate), (c) => { + const data = c.req.valid('json') + return c.json({ success: true, data }) +}) +``` + +--- + +## ArkType + +**Install**: `npm install arktype @hono/arktype-validator` + +**Pros**: +- ✅ Excellent performance (1.5x faster than Zod) +- ✅ Intuitive string-based syntax +- ✅ Great error messages +- ✅ TypeScript-first +- ✅ Small bundle size (~15KB) + +**Cons**: +- ❌ Newer library +- ❌ Smaller ecosystem +- ❌ Different syntax (learning curve) + +**Best for**: +- Developers who prefer string-based schemas +- Performance-conscious projects +- Projects that value developer experience + +**Example**: +```typescript +import { arktypeValidator } from '@hono/arktype-validator' +import { type } from 'arktype' + +const schema = type({ + name: 'string', + email: 'email', + 'age?': 'number>=18', +}) + +app.post('/users', arktypeValidator('json', schema), (c) => { + const data = c.req.valid('json') + return c.json({ success: true, data }) +}) +``` + +--- + +## Performance Benchmarks + +Based on community benchmarks (approximate): + +``` +Typia: ~10,000,000 validations/sec (Fastest - AOT) +Valibot: ~5,000,000 validations/sec +ArkType: ~3,500,000 validations/sec +Zod: ~2,300,000 validations/sec +``` + +**Note**: Actual performance varies by schema complexity and runtime. + +--- + +## Bundle Size Comparison + +``` +Typia: 0 KB (AOT compilation) +Valibot: 1-5 KB (with tree-shaking) +ArkType: ~15 KB +Zod: ~57 KB +``` + +--- + +## Feature Comparison + +### Transformations + +| Library | Support | Example | +|---------|---------|---------| +| Zod | ✅ | `z.string().transform(Number)` | +| Valibot | ✅ | `v.pipe(v.string(), v.transform(Number))` | +| Typia | ✅ | Built into types | +| ArkType | ✅ | Type inference | + +### Refinements + +| Library | Support | Example | +|---------|---------|---------| +| Zod | ✅ | `z.string().refine((val) => val.length > 0)` | +| Valibot | ✅ | `v.pipe(v.string(), v.check((val) => val.length > 0))` | +| Typia | ✅ | Custom validators | +| ArkType | ✅ | Narrow types | + +### Default Values + +| Library | Support | Example | +|---------|---------|---------| +| Zod | ✅ | `z.string().default('default')` | +| Valibot | ✅ | `v.optional(v.string(), 'default')` | +| Typia | ⚠️ | Limited | +| ArkType | ✅ | Type defaults | + +--- + +## Recommendations + +### Choose **Zod** if: +- You want the largest ecosystem and community +- You need extensive documentation and examples +- Bundle size is not a primary concern +- You want battle-tested reliability + +### Choose **Valibot** if: +- Bundle size is critical +- You want Zod-like API with better performance +- You're building a modern application with tree-shaking +- You want modular imports + +### Choose **Typia** if: +- Performance is absolutely critical +- You can afford a more complex build setup +- Zero runtime overhead is required +- You're already using TypeScript transformers + +### Choose **ArkType** if: +- You prefer string-based schema syntax +- You want excellent error messages +- Performance is important but not critical +- You value developer experience + +--- + +## Migration Guide + +### Zod → Valibot + +```typescript +// Zod +const schema = z.object({ + name: z.string().min(1), + age: z.number().optional(), +}) + +// Valibot +const schema = v.object({ + name: v.pipe(v.string(), v.minLength(1)), + age: v.optional(v.number()), +}) +``` + +### Zod → ArkType + +```typescript +// Zod +const schema = z.object({ + name: z.string().min(1), + age: z.number().optional(), +}) + +// ArkType +const schema = type({ + name: 'string>0', + 'age?': 'number', +}) +``` + +--- + +## Official Documentation + +- **Zod**: https://zod.dev +- **Valibot**: https://valibot.dev +- **Typia**: https://typia.io +- **ArkType**: https://arktype.io +- **Hono Validators**: https://hono.dev/docs/guides/validation diff --git a/scripts/check-versions.sh b/scripts/check-versions.sh new file mode 100755 index 0000000..3a23d91 --- /dev/null +++ b/scripts/check-versions.sh @@ -0,0 +1,74 @@ +#!/bin/bash + +# Hono Skill - Package Version Checker +# Verifies that all package versions are current + +echo "🔍 Checking Hono skill package versions..." +echo "" + +# Color codes +GREEN='\033[0;32m' +YELLOW='\033[1;33m' +RED='\033[0;31m' +NC='\033[0m' # No Color + +# Counter for outdated packages +OUTDATED=0 + +# Function to check package version +check_package() { + local package=$1 + local current_version=$2 + + echo -n "Checking $package... " + + # Get latest version from npm + latest=$(npm view "$package" version 2>/dev/null) + + if [ $? -ne 0 ]; then + echo -e "${RED}ERROR${NC} (package not found)" + return 1 + fi + + if [ "$current_version" == "$latest" ]; then + echo -e "${GREEN}✓${NC} $current_version (latest)" + else + echo -e "${YELLOW}⚠${NC} $current_version → $latest (update available)" + ((OUTDATED++)) + fi +} + +echo "Core Dependencies:" +echo "─────────────────" +check_package "hono" "4.10.2" +echo "" + +echo "Validation Libraries:" +echo "────────────────────" +check_package "zod" "4.1.12" +check_package "valibot" "1.1.0" +echo "" + +echo "Hono Validators:" +echo "───────────────" +check_package "@hono/zod-validator" "0.7.4" +check_package "@hono/valibot-validator" "0.5.3" +check_package "@hono/typia-validator" "0.1.2" +check_package "@hono/arktype-validator" "2.0.1" +echo "" + +echo "Summary:" +echo "────────" +if [ $OUTDATED -eq 0 ]; then + echo -e "${GREEN}✓${NC} All packages are up to date!" +else + echo -e "${YELLOW}⚠${NC} $OUTDATED package(s) have updates available" + echo "" + echo "To update, run:" + echo " npm install hono@latest" + echo " npm install zod@latest valibot@latest" + echo " npm install @hono/zod-validator@latest @hono/valibot-validator@latest" +fi + +echo "" +echo "Last checked: $(date)" diff --git a/templates/context-extension.ts b/templates/context-extension.ts new file mode 100644 index 0000000..828f4c4 --- /dev/null +++ b/templates/context-extension.ts @@ -0,0 +1,422 @@ +/** + * Hono Context Extension + * + * Type-safe context extension using c.set() and c.get() with custom Variables. + */ + +import { Hono } from 'hono' +import type { Context, Next } from 'hono' + +// ============================================================================ +// TYPE DEFINITIONS +// ============================================================================ + +// Define environment bindings (for Cloudflare Workers, etc.) +type Bindings = { + DATABASE_URL: string + API_KEY: string + ENVIRONMENT: 'development' | 'staging' | 'production' +} + +// Define context variables (c.set/c.get) +type Variables = { + user: { + id: string + email: string + name: string + role: 'admin' | 'user' + } + requestId: string + startTime: number + logger: { + info: (message: string, meta?: any) => void + warn: (message: string, meta?: any) => void + error: (message: string, meta?: any) => void + } + db: { + query: (sql: string, params?: any[]) => Promise + execute: (sql: string, params?: any[]) => Promise + } + cache: { + get: (key: string) => Promise + set: (key: string, value: string, ttl?: number) => Promise + delete: (key: string) => Promise + } +} + +// Create typed app +const app = new Hono<{ Bindings: Bindings; Variables: Variables }>() + +// ============================================================================ +// REQUEST ID MIDDLEWARE +// ============================================================================ + +app.use('*', async (c, next) => { + const requestId = crypto.randomUUID() + c.set('requestId', requestId) + + await next() + + c.res.headers.set('X-Request-ID', requestId) +}) + +// ============================================================================ +// PERFORMANCE TIMING MIDDLEWARE +// ============================================================================ + +app.use('*', async (c, next) => { + const startTime = Date.now() + c.set('startTime', startTime) + + await next() + + const elapsed = Date.now() - startTime + c.res.headers.set('X-Response-Time', `${elapsed}ms`) + + const logger = c.get('logger') + logger.info(`Request completed in ${elapsed}ms`, { + path: c.req.path, + method: c.req.method, + }) +}) + +// ============================================================================ +// LOGGER MIDDLEWARE +// ============================================================================ + +app.use('*', async (c, next) => { + const requestId = c.get('requestId') + + const logger = { + info: (message: string, meta?: any) => { + console.log( + JSON.stringify({ + level: 'info', + requestId, + message, + ...meta, + timestamp: new Date().toISOString(), + }) + ) + }, + warn: (message: string, meta?: any) => { + console.warn( + JSON.stringify({ + level: 'warn', + requestId, + message, + ...meta, + timestamp: new Date().toISOString(), + }) + ) + }, + error: (message: string, meta?: any) => { + console.error( + JSON.stringify({ + level: 'error', + requestId, + message, + ...meta, + timestamp: new Date().toISOString(), + }) + ) + }, + } + + c.set('logger', logger) + + await next() +}) + +// ============================================================================ +// DATABASE MIDDLEWARE +// ============================================================================ + +app.use('/api/*', async (c, next) => { + // Simulated database connection + const db = { + query: async (sql: string, params?: any[]): Promise => { + const logger = c.get('logger') + logger.info('Executing query', { sql, params }) + + // Simulated query execution + return [] as T[] + }, + execute: async (sql: string, params?: any[]): Promise => { + const logger = c.get('logger') + logger.info('Executing statement', { sql, params }) + + // Simulated execution + }, + } + + c.set('db', db) + + await next() +}) + +// ============================================================================ +// CACHE MIDDLEWARE +// ============================================================================ + +app.use('/api/*', async (c, next) => { + // Simulated cache (use Redis, KV, etc. in production) + const cacheStore = new Map() + + const cache = { + get: async (key: string): Promise => { + const logger = c.get('logger') + const entry = cacheStore.get(key) + + if (!entry) { + logger.info('Cache miss', { key }) + return null + } + + if (entry.expiresAt < Date.now()) { + logger.info('Cache expired', { key }) + cacheStore.delete(key) + return null + } + + logger.info('Cache hit', { key }) + return entry.value + }, + set: async (key: string, value: string, ttl: number = 60000): Promise => { + const logger = c.get('logger') + logger.info('Cache set', { key, ttl }) + + cacheStore.set(key, { + value, + expiresAt: Date.now() + ttl, + }) + }, + delete: async (key: string): Promise => { + const logger = c.get('logger') + logger.info('Cache delete', { key }) + + cacheStore.delete(key) + }, + } + + c.set('cache', cache) + + await next() +}) + +// ============================================================================ +// AUTHENTICATION MIDDLEWARE +// ============================================================================ + +app.use('/api/*', async (c, next) => { + const token = c.req.header('Authorization')?.replace('Bearer ', '') + const logger = c.get('logger') + + if (!token) { + logger.warn('Missing authentication token') + return c.json({ error: 'Unauthorized' }, 401) + } + + // Simulated token validation + if (token !== 'valid-token') { + logger.warn('Invalid authentication token') + return c.json({ error: 'Invalid token' }, 401) + } + + // Simulated user lookup + const user = { + id: '123', + email: 'user@example.com', + name: 'John Doe', + role: 'user' as const, + } + + c.set('user', user) + logger.info('User authenticated', { userId: user.id }) + + await next() +}) + +// ============================================================================ +// ROUTES USING CONTEXT +// ============================================================================ + +// Route using logger +app.get('/api/log-example', (c) => { + const logger = c.get('logger') + + logger.info('This is an info message') + logger.warn('This is a warning') + logger.error('This is an error') + + return c.json({ message: 'Logged' }) +}) + +// Route using user +app.get('/api/profile', (c) => { + const user = c.get('user') + + return c.json({ + user: { + id: user.id, + email: user.email, + name: user.name, + role: user.role, + }, + }) +}) + +// Route using database +app.get('/api/users', async (c) => { + const db = c.get('db') + const logger = c.get('logger') + + try { + const users = await db.query<{ id: string; name: string }>('SELECT * FROM users') + + return c.json({ users }) + } catch (error) { + logger.error('Database query failed', { error }) + return c.json({ error: 'Database error' }, 500) + } +}) + +// Route using cache +app.get('/api/cached-data', async (c) => { + const cache = c.get('cache') + const logger = c.get('logger') + + const cacheKey = 'expensive-data' + + // Try to get from cache + const cached = await cache.get(cacheKey) + + if (cached) { + return c.json({ data: JSON.parse(cached), cached: true }) + } + + // Simulate expensive computation + const data = { result: 'expensive data', timestamp: Date.now() } + + // Store in cache + await cache.set(cacheKey, JSON.stringify(data), 60000) // 1 minute + + return c.json({ data, cached: false }) +}) + +// Route using request ID +app.get('/api/request-info', (c) => { + const requestId = c.get('requestId') + const startTime = c.get('startTime') + const elapsed = Date.now() - startTime + + return c.json({ + requestId, + elapsed: `${elapsed}ms`, + method: c.req.method, + path: c.req.path, + }) +}) + +// Route using environment bindings +app.get('/api/env', (c) => { + const environment = c.env.ENVIRONMENT + const apiKey = c.env.API_KEY // Don't expose this in real app! + + return c.json({ + environment, + hasApiKey: !!apiKey, + }) +}) + +// ============================================================================ +// COMBINING MULTIPLE CONTEXT VALUES +// ============================================================================ + +app.post('/api/create-user', async (c) => { + const logger = c.get('logger') + const db = c.get('db') + const user = c.get('user') + const requestId = c.get('requestId') + + // Check permissions + if (user.role !== 'admin') { + logger.warn('Unauthorized user creation attempt', { + userId: user.id, + requestId, + }) + + return c.json({ error: 'Forbidden' }, 403) + } + + // Parse request body + const body = await c.req.json() + + // Create user + try { + await db.execute('INSERT INTO users (name, email) VALUES (?, ?)', [body.name, body.email]) + + logger.info('User created', { + createdBy: user.id, + newUserEmail: body.email, + requestId, + }) + + return c.json({ success: true }, 201) + } catch (error) { + logger.error('User creation failed', { + error, + requestId, + }) + + return c.json({ error: 'Failed to create user' }, 500) + } +}) + +// ============================================================================ +// CUSTOM CONTEXT HELPERS +// ============================================================================ + +// Helper to get authenticated user (with type guard) +function getAuthenticatedUser(c: Context<{ Bindings: Bindings; Variables: Variables }>) { + const user = c.get('user') + + if (!user) { + throw new Error('User not authenticated') + } + + return user +} + +// Helper to check admin role +function requireAdmin(c: Context<{ Bindings: Bindings; Variables: Variables }>) { + const user = getAuthenticatedUser(c) + + if (user.role !== 'admin') { + throw new Error('Admin access required') + } + + return user +} + +// Usage +app.delete('/api/users/:id', (c) => { + const admin = requireAdmin(c) // Throws if not admin + const logger = c.get('logger') + + logger.info('User deletion requested', { + adminId: admin.id, + targetUserId: c.req.param('id'), + }) + + return c.json({ success: true }) +}) + +// ============================================================================ +// EXPORT +// ============================================================================ + +export default app + +export type { Bindings, Variables } +export { getAuthenticatedUser, requireAdmin } diff --git a/templates/error-handling.ts b/templates/error-handling.ts new file mode 100644 index 0000000..b7e5308 --- /dev/null +++ b/templates/error-handling.ts @@ -0,0 +1,409 @@ +/** + * Hono Error Handling + * + * Complete examples for error handling using HTTPException, onError, and custom error handlers. + */ + +import { Hono } from 'hono' +import { HTTPException } from 'hono/http-exception' +import { zValidator } from '@hono/zod-validator' +import { z } from 'zod' + +const app = new Hono() + +// ============================================================================ +// HTTPEXCEPTION - CLIENT ERRORS (400-499) +// ============================================================================ + +// 400 Bad Request +app.get('/bad-request', (c) => { + throw new HTTPException(400, { message: 'Bad Request - Invalid parameters' }) +}) + +// 401 Unauthorized +app.get('/unauthorized', (c) => { + throw new HTTPException(401, { message: 'Unauthorized - Missing or invalid token' }) +}) + +// 403 Forbidden +app.get('/forbidden', (c) => { + throw new HTTPException(403, { message: 'Forbidden - Insufficient permissions' }) +}) + +// 404 Not Found +app.get('/users/:id', async (c) => { + const id = c.req.param('id') + + // Simulate database lookup + const user = null // await db.findUser(id) + + if (!user) { + throw new HTTPException(404, { message: `User with ID ${id} not found` }) + } + + return c.json({ user }) +}) + +// Custom response body +app.get('/custom-error', (c) => { + const res = new Response( + JSON.stringify({ + error: 'CUSTOM_ERROR', + code: 'ERR001', + details: 'Custom error details', + }), + { + status: 400, + headers: { + 'Content-Type': 'application/json', + }, + } + ) + + throw new HTTPException(400, { res }) +}) + +// ============================================================================ +// AUTHENTICATION ERRORS +// ============================================================================ + +app.get('/protected', (c) => { + const token = c.req.header('Authorization') + + if (!token) { + throw new HTTPException(401, { + message: 'Missing Authorization header', + }) + } + + if (!token.startsWith('Bearer ')) { + throw new HTTPException(401, { + message: 'Invalid Authorization header format', + }) + } + + const actualToken = token.replace('Bearer ', '') + + if (actualToken !== 'valid-token') { + throw new HTTPException(401, { + message: 'Invalid or expired token', + }) + } + + return c.json({ message: 'Access granted', data: 'Protected data' }) +}) + +// ============================================================================ +// VALIDATION ERRORS +// ============================================================================ + +const userSchema = z.object({ + name: z.string().min(1), + email: z.string().email(), + age: z.number().int().min(18), +}) + +// Validation errors automatically return 400 +app.post('/users', zValidator('json', userSchema), (c) => { + const data = c.req.valid('json') + return c.json({ success: true, data }) +}) + +// Custom validation error handler +app.post( + '/users/custom', + zValidator('json', userSchema, (result, c) => { + if (!result.success) { + throw new HTTPException(400, { + message: 'Validation failed', + cause: result.error, + }) + } + }), + (c) => { + const data = c.req.valid('json') + return c.json({ success: true, data }) + } +) + +// ============================================================================ +// GLOBAL ERROR HANDLER (onError) +// ============================================================================ + +app.onError((err, c) => { + console.error(`Error on ${c.req.method} ${c.req.path}:`, err) + + // Handle HTTPException + if (err instanceof HTTPException) { + // Get custom response if provided + if (err.res) { + return err.res + } + + // Return default HTTPException response + return c.json( + { + error: err.message, + status: err.status, + }, + err.status + ) + } + + // Handle Zod validation errors + if (err.name === 'ZodError') { + return c.json( + { + error: 'Validation failed', + issues: err.issues, + }, + 400 + ) + } + + // Handle unexpected errors (500) + return c.json( + { + error: 'Internal Server Error', + message: process.env.NODE_ENV === 'development' ? err.message : 'An unexpected error occurred', + }, + 500 + ) +}) + +// ============================================================================ +// NOT FOUND HANDLER +// ============================================================================ + +app.notFound((c) => { + return c.json( + { + error: 'Not Found', + message: `Route ${c.req.method} ${c.req.path} not found`, + }, + 404 + ) +}) + +// ============================================================================ +// MIDDLEWARE ERROR CHECKING +// ============================================================================ + +app.use('*', async (c, next) => { + await next() + + // Check for errors after handler execution + if (c.error) { + console.error('Error detected in middleware:', { + error: c.error.message, + path: c.req.path, + method: c.req.method, + }) + + // Send to error tracking service + // await sendToSentry(c.error, { path: c.req.path, method: c.req.method }) + } +}) + +// ============================================================================ +// TRY-CATCH ERROR HANDLING +// ============================================================================ + +app.get('/external-api', async (c) => { + try { + // Simulated external API call + const response = await fetch('https://api.example.com/data') + + if (!response.ok) { + throw new HTTPException(response.status, { + message: `External API returned ${response.status}`, + }) + } + + const data = await response.json() + return c.json({ data }) + } catch (error) { + // Network errors or parsing errors + if (error instanceof HTTPException) { + throw error // Re-throw HTTPException + } + + // Log unexpected error + console.error('External API error:', error) + + // Return generic error to client + throw new HTTPException(503, { + message: 'External service unavailable', + }) + } +}) + +// ============================================================================ +// CONDITIONAL ERROR RESPONSES +// ============================================================================ + +app.get('/data/:id', async (c) => { + const id = c.req.param('id') + + // Validate ID format + if (!/^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i.test(id)) { + throw new HTTPException(400, { + message: 'Invalid UUID format', + }) + } + + // Check access permissions + const hasAccess = true // await checkUserAccess(id) + + if (!hasAccess) { + throw new HTTPException(403, { + message: 'You do not have permission to access this resource', + }) + } + + // Fetch data + const data = null // await db.getData(id) + + if (!data) { + throw new HTTPException(404, { + message: 'Resource not found', + }) + } + + return c.json({ data }) +}) + +// ============================================================================ +// TYPED ERROR RESPONSES +// ============================================================================ + +type ErrorResponse = { + error: string + code: string + details?: string +} + +function createErrorResponse(code: string, message: string, details?: string): ErrorResponse { + return { + error: message, + code, + details, + } +} + +app.get('/typed-error', (c) => { + const errorBody = createErrorResponse('USER_NOT_FOUND', 'User not found', 'The requested user does not exist') + + throw new HTTPException(404, { + res: c.json(errorBody, 404), + }) +}) + +// ============================================================================ +// CUSTOM ERROR CLASSES +// ============================================================================ + +class ValidationError extends HTTPException { + constructor(message: string, cause?: any) { + super(400, { message, cause }) + this.name = 'ValidationError' + } +} + +class AuthenticationError extends HTTPException { + constructor(message: string) { + super(401, { message }) + this.name = 'AuthenticationError' + } +} + +class AuthorizationError extends HTTPException { + constructor(message: string) { + super(403, { message }) + this.name = 'AuthorizationError' + } +} + +class NotFoundError extends HTTPException { + constructor(resource: string) { + super(404, { message: `${resource} not found` }) + this.name = 'NotFoundError' + } +} + +// Usage +app.get('/custom-errors/:id', async (c) => { + const id = c.req.param('id') + + if (!id) { + throw new ValidationError('ID is required') + } + + const user = null // await db.findUser(id) + + if (!user) { + throw new NotFoundError('User') + } + + return c.json({ user }) +}) + +// Handle custom error classes in onError +app.onError((err, c) => { + if (err instanceof ValidationError) { + return c.json({ error: err.message, type: 'validation' }, err.status) + } + + if (err instanceof AuthenticationError) { + return c.json({ error: err.message, type: 'authentication' }, err.status) + } + + if (err instanceof NotFoundError) { + return c.json({ error: err.message, type: 'not_found' }, err.status) + } + + if (err instanceof HTTPException) { + return err.getResponse() + } + + return c.json({ error: 'Internal Server Error' }, 500) +}) + +// ============================================================================ +// ERROR LOGGING WITH CONTEXT +// ============================================================================ + +app.use('*', async (c, next) => { + const requestId = crypto.randomUUID() + c.set('requestId', requestId) + + try { + await next() + } catch (error) { + // Log with context + console.error('Request failed', { + requestId, + method: c.req.method, + path: c.req.path, + error: error instanceof Error ? error.message : 'Unknown error', + stack: error instanceof Error ? error.stack : undefined, + }) + + // Re-throw to be handled by onError + throw error + } +}) + +// ============================================================================ +// EXPORT +// ============================================================================ + +export default app + +export { + ValidationError, + AuthenticationError, + AuthorizationError, + NotFoundError, + createErrorResponse, +} diff --git a/templates/middleware-composition.ts b/templates/middleware-composition.ts new file mode 100644 index 0000000..9285372 --- /dev/null +++ b/templates/middleware-composition.ts @@ -0,0 +1,418 @@ +/** + * Hono Middleware Composition + * + * Complete examples for middleware chaining, built-in middleware, and custom middleware. + */ + +import { Hono } from 'hono' +import type { Next } from 'hono' +import type { Context } from 'hono' + +// Built-in middleware +import { logger } from 'hono/logger' +import { cors } from 'hono/cors' +import { prettyJSON } from 'hono/pretty-json' +import { compress } from 'hono/compress' +import { cache } from 'hono/cache' +import { etag } from 'hono/etag' +import { secureHeaders } from 'hono/secure-headers' +import { timing } from 'hono/timing' + +const app = new Hono() + +// ============================================================================ +// BUILT-IN MIDDLEWARE +// ============================================================================ + +// Request logging (prints to console) +app.use('*', logger()) + +// CORS (for API routes) +app.use( + '/api/*', + cors({ + origin: ['https://example.com', 'https://app.example.com'], + allowMethods: ['GET', 'POST', 'PUT', 'DELETE', 'OPTIONS'], + allowHeaders: ['Content-Type', 'Authorization'], + exposeHeaders: ['X-Request-ID'], + maxAge: 600, + credentials: true, + }) +) + +// Pretty JSON (development only - adds indentation) +if (process.env.NODE_ENV === 'development') { + app.use('*', prettyJSON()) +} + +// Compression (gzip/deflate) +app.use('*', compress()) + +// Caching (HTTP cache headers) +app.use( + '/static/*', + cache({ + cacheName: 'my-app', + cacheControl: 'max-age=3600', + }) +) + +// ETag support +app.use('/api/*', etag()) + +// Security headers +app.use('*', secureHeaders()) + +// Server timing header +app.use('*', timing()) + +// ============================================================================ +// CUSTOM MIDDLEWARE +// ============================================================================ + +// Request ID middleware +const requestIdMiddleware = async (c: Context, next: Next) => { + const requestId = crypto.randomUUID() + c.set('requestId', requestId) + + await next() + + // Add to response headers + c.res.headers.set('X-Request-ID', requestId) +} + +app.use('*', requestIdMiddleware) + +// Performance timing middleware +const performanceMiddleware = async (c: Context, next: Next) => { + const start = Date.now() + + await next() + + const elapsed = Date.now() - start + c.res.headers.set('X-Response-Time', `${elapsed}ms`) + + console.log(`${c.req.method} ${c.req.path} - ${elapsed}ms`) +} + +app.use('*', performanceMiddleware) + +// Error logging middleware +const errorLoggerMiddleware = async (c: Context, next: Next) => { + await next() + + // Check for errors after handler execution + if (c.error) { + console.error('Error occurred:', { + error: c.error.message, + stack: c.error.stack, + path: c.req.path, + method: c.req.method, + }) + + // Send to error tracking service (e.g., Sentry) + // await sendToErrorTracker(c.error, c.req) + } +} + +app.use('*', errorLoggerMiddleware) + +// ============================================================================ +// AUTHENTICATION MIDDLEWARE +// ============================================================================ + +// Simple token authentication +const authMiddleware = async (c: Context, next: Next) => { + const token = c.req.header('Authorization')?.replace('Bearer ', '') + + if (!token) { + return c.json({ error: 'Unauthorized' }, 401) + } + + // Validate token (simplified example) + if (token !== 'secret-token') { + return c.json({ error: 'Invalid token' }, 401) + } + + // Set user in context + c.set('user', { + id: 1, + name: 'John Doe', + email: 'john@example.com', + }) + + await next() +} + +// Apply to specific routes +app.use('/admin/*', authMiddleware) +app.use('/api/protected/*', authMiddleware) + +// ============================================================================ +// RATE LIMITING MIDDLEWARE +// ============================================================================ + +// Simple in-memory rate limiter (production: use Redis/KV) +const rateLimits = new Map() + +const rateLimitMiddleware = (maxRequests: number, windowMs: number) => { + return async (c: Context, next: Next) => { + const ip = c.req.header('CF-Connecting-IP') || 'unknown' + const now = Date.now() + + const limit = rateLimits.get(ip) + + if (!limit || limit.resetAt < now) { + // New window + rateLimits.set(ip, { + count: 1, + resetAt: now + windowMs, + }) + } else if (limit.count >= maxRequests) { + // Rate limit exceeded + return c.json( + { + error: 'Too many requests', + retryAfter: Math.ceil((limit.resetAt - now) / 1000), + }, + 429 + ) + } else { + // Increment count + limit.count++ + } + + await next() + } +} + +// Apply rate limiting (100 requests per minute) +app.use('/api/*', rateLimitMiddleware(100, 60000)) + +// ============================================================================ +// MIDDLEWARE CHAINING +// ============================================================================ + +// Multiple middleware for specific route +app.get( + '/protected/data', + authMiddleware, + rateLimitMiddleware(10, 60000), + (c) => { + const user = c.get('user') + return c.json({ message: 'Protected data', user }) + } +) + +// ============================================================================ +// CONDITIONAL MIDDLEWARE +// ============================================================================ + +// Apply middleware based on condition +const conditionalMiddleware = async (c: Context, next: Next) => { + const isDevelopment = process.env.NODE_ENV === 'development' + + if (isDevelopment) { + console.log('[DEV]', c.req.method, c.req.path) + } + + await next() +} + +app.use('*', conditionalMiddleware) + +// ============================================================================ +// MIDDLEWARE FACTORY PATTERN +// ============================================================================ + +// Middleware factory for custom headers +const customHeadersMiddleware = (headers: Record) => { + return async (c: Context, next: Next) => { + await next() + + for (const [key, value] of Object.entries(headers)) { + c.res.headers.set(key, value) + } + } +} + +// Apply custom headers +app.use( + '/api/*', + customHeadersMiddleware({ + 'X-API-Version': '1.0.0', + 'X-Powered-By': 'Hono', + }) +) + +// ============================================================================ +// CONTEXT EXTENSION MIDDLEWARE +// ============================================================================ + +// Logger middleware (extends context) +const loggerMiddleware = async (c: Context, next: Next) => { + const logger = { + info: (message: string) => console.log(`[INFO] ${message}`), + warn: (message: string) => console.warn(`[WARN] ${message}`), + error: (message: string) => console.error(`[ERROR] ${message}`), + } + + c.set('logger', logger) + + await next() +} + +app.use('*', loggerMiddleware) + +// Use logger in routes +app.get('/log-example', (c) => { + const logger = c.get('logger') + logger.info('This is an info message') + + return c.json({ message: 'Logged' }) +}) + +// ============================================================================ +// DATABASE CONNECTION MIDDLEWARE +// ============================================================================ + +// Database connection (simplified example) +const dbMiddleware = async (c: Context, next: Next) => { + // Simulated database connection + const db = { + query: async (sql: string) => { + console.log('Executing query:', sql) + return [] + }, + close: async () => { + console.log('Closing database connection') + }, + } + + c.set('db', db) + + await next() + + // Cleanup + await db.close() +} + +app.use('/api/*', dbMiddleware) + +// ============================================================================ +// REQUEST VALIDATION MIDDLEWARE +// ============================================================================ + +// Content-Type validation +const jsonOnlyMiddleware = async (c: Context, next: Next) => { + const contentType = c.req.header('Content-Type') + + if (c.req.method === 'POST' || c.req.method === 'PUT') { + if (!contentType || !contentType.includes('application/json')) { + return c.json( + { + error: 'Content-Type must be application/json', + }, + 415 + ) + } + } + + await next() +} + +app.use('/api/*', jsonOnlyMiddleware) + +// ============================================================================ +// MIDDLEWARE EXECUTION ORDER +// ============================================================================ + +// Middleware runs in order: top to bottom before handler, bottom to top after +app.use('*', async (c, next) => { + console.log('1: Before handler') + await next() + console.log('6: After handler') +}) + +app.use('*', async (c, next) => { + console.log('2: Before handler') + await next() + console.log('5: After handler') +}) + +app.use('*', async (c, next) => { + console.log('3: Before handler') + await next() + console.log('4: After handler') +}) + +app.get('/middleware-order', (c) => { + console.log('Handler') + return c.json({ message: 'Check console for execution order' }) +}) + +// Output: 1, 2, 3, Handler, 4, 5, 6 + +// ============================================================================ +// EARLY RETURN FROM MIDDLEWARE +// ============================================================================ + +// Middleware can return early (short-circuit) +const maintenanceMiddleware = async (c: Context, next: Next) => { + const isMaintenanceMode = false // Set to true to enable + + if (isMaintenanceMode) { + // Don't call next() - return response directly + return c.json( + { + error: 'Service is under maintenance', + retryAfter: 3600, + }, + 503 + ) + } + + await next() +} + +app.use('*', maintenanceMiddleware) + +// ============================================================================ +// TYPE-SAFE MIDDLEWARE +// ============================================================================ + +type Bindings = { + DATABASE_URL: string + API_KEY: string +} + +type Variables = { + user: { id: number; name: string; email: string } + requestId: string + logger: { + info: (message: string) => void + error: (message: string) => void + } + db: { + query: (sql: string) => Promise + close: () => Promise + } +} + +// Typed app +const typedApp = new Hono<{ Bindings: Bindings; Variables: Variables }>() + +// Type-safe middleware +typedApp.use('*', async (c, next) => { + const user = c.get('user') // Type-safe! + const logger = c.get('logger') // Type-safe! + + await next() +}) + +// ============================================================================ +// EXPORT +// ============================================================================ + +export default app +export { typedApp } diff --git a/templates/package.json b/templates/package.json new file mode 100644 index 0000000..8d92eb0 --- /dev/null +++ b/templates/package.json @@ -0,0 +1,33 @@ +{ + "name": "hono-app", + "version": "1.0.0", + "type": "module", + "description": "Hono application with routing, middleware, validation, and RPC", + "scripts": { + "dev": "tsx watch src/index.ts", + "build": "tsc", + "start": "node dist/index.js", + "type-check": "tsc --noEmit" + }, + "dependencies": { + "hono": "^4.10.2" + }, + "devDependencies": { + "typescript": "^5.9.0", + "tsx": "^4.19.0", + "@types/node": "^22.10.0" + }, + "optionalDependencies": { + "zod": "^4.1.12", + "valibot": "^1.1.0", + "@hono/zod-validator": "^0.7.4", + "@hono/valibot-validator": "^0.5.3", + "@hono/typia-validator": "^0.1.2", + "@hono/arktype-validator": "^2.0.1", + "arktype": "^2.0.0", + "typia": "^7.1.0" + }, + "engines": { + "node": ">=18.0.0" + } +} diff --git a/templates/routing-patterns.ts b/templates/routing-patterns.ts new file mode 100644 index 0000000..ecd1490 --- /dev/null +++ b/templates/routing-patterns.ts @@ -0,0 +1,299 @@ +/** + * Hono Routing Patterns + * + * Complete examples for route parameters, query params, wildcards, and route grouping. + */ + +import { Hono } from 'hono' + +const app = new Hono() + +// ============================================================================ +// BASIC ROUTES +// ============================================================================ + +// GET request +app.get('/posts', (c) => { + return c.json({ + posts: [ + { id: 1, title: 'First Post' }, + { id: 2, title: 'Second Post' }, + ], + }) +}) + +// POST request +app.post('/posts', async (c) => { + const body = await c.req.json() + return c.json({ created: true, data: body }, 201) +}) + +// PUT request +app.put('/posts/:id', async (c) => { + const id = c.req.param('id') + const body = await c.req.json() + return c.json({ updated: true, id, data: body }) +}) + +// DELETE request +app.delete('/posts/:id', (c) => { + const id = c.req.param('id') + return c.json({ deleted: true, id }) +}) + +// Multiple methods on same route +app.on(['GET', 'POST'], '/multi', (c) => { + return c.text(`Method: ${c.req.method}`) +}) + +// All HTTP methods +app.all('/catch-all', (c) => { + return c.text(`Any method works: ${c.req.method}`) +}) + +// ============================================================================ +// ROUTE PARAMETERS +// ============================================================================ + +// Single parameter +app.get('/users/:id', (c) => { + const id = c.req.param('id') + + return c.json({ + userId: id, + name: 'John Doe', + }) +}) + +// Multiple parameters +app.get('/posts/:postId/comments/:commentId', (c) => { + const { postId, commentId } = c.req.param() + + return c.json({ + postId, + commentId, + comment: 'This is a comment', + }) +}) + +// Optional parameters (using wildcards) +app.get('/files/*', (c) => { + const path = c.req.param('*') + + return c.json({ + filePath: path || 'root', + message: 'File accessed', + }) +}) + +// Named wildcard (regex pattern) +app.get('/assets/:filepath{.+}', (c) => { + const filepath = c.req.param('filepath') + + return c.json({ + asset: filepath, + contentType: 'application/octet-stream', + }) +}) + +// ============================================================================ +// QUERY PARAMETERS +// ============================================================================ + +// Single query param +app.get('/search', (c) => { + const q = c.req.query('q') // ?q=hello + + return c.json({ + query: q, + results: [], + }) +}) + +// Multiple query params +app.get('/products', (c) => { + const page = c.req.query('page') || '1' // ?page=2 + const limit = c.req.query('limit') || '10' // ?limit=20 + const sort = c.req.query('sort') || 'name' // ?sort=price + + return c.json({ + page: parseInt(page, 10), + limit: parseInt(limit, 10), + sort, + products: [], + }) +}) + +// All query params as object +app.get('/filter', (c) => { + const query = c.req.query() + + return c.json({ + filters: query, + results: [], + }) +}) + +// Array query params (e.g., ?tag=js&tag=ts) +app.get('/tags', (c) => { + const tags = c.req.queries('tag') // returns string[] + + return c.json({ + tags: tags || [], + count: tags?.length || 0, + }) +}) + +// ============================================================================ +// WILDCARD ROUTES +// ============================================================================ + +// Catch-all route (must be last) +app.get('/api/*', (c) => { + const path = c.req.param('*') + + return c.json({ + message: 'API catch-all', + requestedPath: path, + }) +}) + +// Multiple wildcard levels +app.get('/cdn/:version/*', (c) => { + const version = c.req.param('version') + const path = c.req.param('*') + + return c.json({ + version, + assetPath: path, + }) +}) + +// ============================================================================ +// ROUTE GROUPING (SUB-APPS) +// ============================================================================ + +// Create API sub-app +const api = new Hono() + +api.get('/users', (c) => { + return c.json({ users: [] }) +}) + +api.get('/posts', (c) => { + return c.json({ posts: [] }) +}) + +api.get('/comments', (c) => { + return c.json({ comments: [] }) +}) + +// Create admin sub-app +const admin = new Hono() + +admin.get('/dashboard', (c) => { + return c.json({ message: 'Admin Dashboard' }) +}) + +admin.get('/users', (c) => { + return c.json({ message: 'Admin Users' }) +}) + +// Mount sub-apps +app.route('/api', api) // Routes: /api/users, /api/posts, /api/comments +app.route('/admin', admin) // Routes: /admin/dashboard, /admin/users + +// ============================================================================ +// ROUTE CHAINING +// ============================================================================ + +// Method chaining for same path +app + .get('/items', (c) => c.json({ items: [] })) + .post('/items', (c) => c.json({ created: true })) + .put('/items/:id', (c) => c.json({ updated: true })) + .delete('/items/:id', (c) => c.json({ deleted: true })) + +// ============================================================================ +// ROUTE PRIORITY +// ============================================================================ + +// Specific routes BEFORE wildcards +app.get('/special/exact', (c) => { + return c.json({ message: 'Exact route' }) +}) + +app.get('/special/*', (c) => { + return c.json({ message: 'Wildcard route' }) +}) + +// Request to /special/exact → "Exact route" +// Request to /special/anything → "Wildcard route" + +// ============================================================================ +// HEADER AND BODY ACCESS +// ============================================================================ + +// Accessing headers +app.get('/headers', (c) => { + const userAgent = c.req.header('User-Agent') + const authorization = c.req.header('Authorization') + + // All headers + const allHeaders = c.req.raw.headers + + return c.json({ + userAgent, + authorization, + allHeaders: Object.fromEntries(allHeaders.entries()), + }) +}) + +// Accessing request body +app.post('/body', async (c) => { + // JSON body + const json = await c.req.json() + + // Text body + // const text = await c.req.text() + + // Form data + // const formData = await c.req.formData() + + // Array buffer + // const buffer = await c.req.arrayBuffer() + + return c.json({ received: json }) +}) + +// ============================================================================ +// ROUTE METADATA +// ============================================================================ + +// Access current route information +app.get('/info', (c) => { + return c.json({ + method: c.req.method, // GET + url: c.req.url, // Full URL + path: c.req.path, // Path only + routePath: c.req.routePath, // Route pattern (e.g., /info) + }) +}) + +// ============================================================================ +// EXPORT +// ============================================================================ + +export default app + +// TypeScript types for environment +type Bindings = { + // Add your environment variables here +} + +type Variables = { + // Add your context variables here +} + +// Typed app +export const typedApp = new Hono<{ Bindings: Bindings; Variables: Variables }>() diff --git a/templates/rpc-client.ts b/templates/rpc-client.ts new file mode 100644 index 0000000..9331373 --- /dev/null +++ b/templates/rpc-client.ts @@ -0,0 +1,268 @@ +/** + * Hono RPC Client + * + * Type-safe client for consuming Hono APIs with full type inference. + */ + +import { hc } from 'hono/client' +import type { AppType, PostsType, SearchType } from './rpc-pattern' + +// ============================================================================ +// BASIC CLIENT SETUP +// ============================================================================ + +// Create client with full type inference +const client = hc('http://localhost:8787') + +// ============================================================================ +// TYPE-SAFE API CALLS +// ============================================================================ + +async function exampleUsage() { + // GET /users + const usersRes = await client.users.$get() + const usersData = await usersRes.json() + // Type: { users: Array<{ id: string, name: string, email: string }> } + + console.log('Users:', usersData.users) + + // POST /users + const createRes = await client.users.$post({ + json: { + name: 'Charlie', + email: 'charlie@example.com', + age: 25, + }, + }) + + if (!createRes.ok) { + console.error('Failed to create user:', createRes.status) + return + } + + const createData = await createRes.json() + // Type: { success: boolean, user: { id: string, name: string, email: string, age?: number } } + + console.log('Created user:', createData.user) + + // GET /users/:id + const userRes = await client.users[':id'].$get({ + param: { id: createData.user.id }, + }) + + const userData = await userRes.json() + // Type: { id: string, name: string, email: string } + + console.log('User:', userData) + + // PATCH /users/:id + const updateRes = await client.users[':id'].$patch({ + param: { id: userData.id }, + json: { + name: 'Charlie Updated', + }, + }) + + const updateData = await updateRes.json() + console.log('Updated user:', updateData) + + // DELETE /users/:id + const deleteRes = await client.users[':id'].$delete({ + param: { id: userData.id }, + }) + + const deleteData = await deleteRes.json() + console.log('Deleted user:', deleteData) +} + +// ============================================================================ +// QUERY PARAMETERS +// ============================================================================ + +const searchClient = hc('http://localhost:8787') + +async function searchExample() { + const res = await searchClient.search.$get({ + query: { + q: 'hello', + page: '2', // Converted to number by schema + }, + }) + + const data = await res.json() + // Type: { query: string, page: number, results: any[] } + + console.log('Search results:', data) +} + +// ============================================================================ +// ERROR HANDLING +// ============================================================================ + +async function errorHandlingExample() { + try { + const res = await client.users.$post({ + json: { + name: '', + email: 'invalid-email', + }, + }) + + if (!res.ok) { + // Handle validation error (400) + if (res.status === 400) { + const error = await res.json() + console.error('Validation error:', error) + return + } + + // Handle other errors + console.error('Request failed:', res.status, res.statusText) + return + } + + const data = await res.json() + console.log('Success:', data) + } catch (error) { + console.error('Network error:', error) + } +} + +// ============================================================================ +// CUSTOM HEADERS +// ============================================================================ + +async function authExample() { + const authedClient = hc('http://localhost:8787', { + headers: { + Authorization: 'Bearer secret-token', + 'X-API-Version': '1.0', + }, + }) + + const res = await authedClient.users.$get() + const data = await res.json() + + console.log('Authed response:', data) +} + +// ============================================================================ +// FETCH OPTIONS +// ============================================================================ + +async function fetchOptionsExample() { + const res = await client.users.$get({}, { + // Standard fetch options + headers: { + 'X-Custom-Header': 'value', + }, + signal: AbortSignal.timeout(5000), // 5 second timeout + }) + + const data = await res.json() + console.log('Data:', data) +} + +// ============================================================================ +// GROUPED ROUTES CLIENT +// ============================================================================ + +const postsClient = hc('http://localhost:8787/posts') + +async function postsExample() { + // GET /posts + const postsRes = await postsClient.index.$get() + const posts = await postsRes.json() + + console.log('Posts:', posts) + + // POST /posts + const createRes = await postsClient.index.$post({ + json: { + title: 'My Post', + content: 'Post content here', + }, + }) + + const newPost = await createRes.json() + console.log('Created post:', newPost) +} + +// ============================================================================ +// FRONTEND USAGE (REACT EXAMPLE) +// ============================================================================ + +import { useState, useEffect } from 'react' + +function UsersComponent() { + const [users, setUsers] = useState([]) + const [loading, setLoading] = useState(false) + + useEffect(() => { + async function fetchUsers() { + setLoading(true) + + try { + const res = await client.users.$get() + const data = await res.json() + setUsers(data.users) + } catch (error) { + console.error('Failed to fetch users:', error) + } finally { + setLoading(false) + } + } + + fetchUsers() + }, []) + + async function createUser(name: string, email: string) { + try { + const res = await client.users.$post({ + json: { name, email }, + }) + + if (!res.ok) { + alert('Failed to create user') + return + } + + const data = await res.json() + setUsers([...users, data.user]) + } catch (error) { + console.error('Failed to create user:', error) + } + } + + if (loading) return
Loading...
+ + return ( +
+

Users

+
    + {users.map((user) => ( +
  • + {user.name} ({user.email}) +
    • + ))} +
+
+ ) +} + +// ============================================================================ +// EXPORT +// ============================================================================ + +export { + client, + searchClient, + postsClient, + exampleUsage, + searchExample, + errorHandlingExample, + authExample, + fetchOptionsExample, + postsExample, + UsersComponent, +} diff --git a/templates/rpc-pattern.ts b/templates/rpc-pattern.ts new file mode 100644 index 0000000..df95e31 --- /dev/null +++ b/templates/rpc-pattern.ts @@ -0,0 +1,202 @@ +/** + * Hono RPC Pattern + * + * Type-safe client/server communication using Hono's RPC feature. + */ + +import { Hono } from 'hono' +import { zValidator } from '@hono/zod-validator' +import { z } from 'zod' + +// ============================================================================ +// SERVER-SIDE: Define Routes with Type Export +// ============================================================================ + +const app = new Hono() + +// Define schemas +const createUserSchema = z.object({ + name: z.string().min(1), + email: z.string().email(), + age: z.number().int().min(18).optional(), +}) + +const updateUserSchema = createUserSchema.partial() + +const userParamSchema = z.object({ + id: z.string().uuid(), +}) + +// ============================================================================ +// METHOD 1: Export Individual Routes +// ============================================================================ + +// Define route and assign to variable (REQUIRED for RPC type inference) +const getUsers = app.get('/users', (c) => { + return c.json({ + users: [ + { id: '1', name: 'Alice', email: 'alice@example.com' }, + { id: '2', name: 'Bob', email: 'bob@example.com' }, + ], + }) +}) + +const createUser = app.post('/users', zValidator('json', createUserSchema), (c) => { + const data = c.req.valid('json') + + return c.json( + { + success: true, + user: { + id: crypto.randomUUID(), + ...data, + }, + }, + 201 + ) +}) + +const getUser = app.get('/users/:id', zValidator('param', userParamSchema), (c) => { + const { id } = c.req.valid('param') + + return c.json({ + id, + name: 'Alice', + email: 'alice@example.com', + }) +}) + +const updateUser = app.patch( + '/users/:id', + zValidator('param', userParamSchema), + zValidator('json', updateUserSchema), + (c) => { + const { id } = c.req.valid('param') + const updates = c.req.valid('json') + + return c.json({ + success: true, + user: { + id, + ...updates, + }, + }) + } +) + +const deleteUser = app.delete('/users/:id', zValidator('param', userParamSchema), (c) => { + const { id } = c.req.valid('param') + + return c.json({ success: true, deletedId: id }) +}) + +// Export combined type for RPC client +export type AppType = typeof getUsers | typeof createUser | typeof getUser | typeof updateUser | typeof deleteUser + +// ============================================================================ +// METHOD 2: Export Entire App (Simpler but slower for large apps) +// ============================================================================ + +const simpleApp = new Hono() + +simpleApp.get('/hello', (c) => { + return c.json({ message: 'Hello!' }) +}) + +simpleApp.post('/echo', zValidator('json', z.object({ message: z.string() })), (c) => { + const { message } = c.req.valid('json') + return c.json({ echo: message }) +}) + +export type SimpleAppType = typeof simpleApp + +// ============================================================================ +// METHOD 3: Group Routes by Domain +// ============================================================================ + +// Posts routes +const postsApp = new Hono() + +const getPosts = postsApp.get('/', (c) => { + return c.json({ posts: [] }) +}) + +const createPost = postsApp.post( + '/', + zValidator( + 'json', + z.object({ + title: z.string(), + content: z.string(), + }) + ), + (c) => { + const data = c.req.valid('json') + return c.json({ success: true, post: { id: '1', ...data } }, 201) + } +) + +export type PostsType = typeof getPosts | typeof createPost + +// Comments routes +const commentsApp = new Hono() + +const getComments = commentsApp.get('/', (c) => { + return c.json({ comments: [] }) +}) + +export type CommentsType = typeof getComments + +// Mount to main app +app.route('/posts', postsApp) +app.route('/comments', commentsApp) + +// ============================================================================ +// MIDDLEWARE WITH RPC +// ============================================================================ + +// Middleware that returns early (short-circuits) +const authMiddleware = async (c: any, next: any) => { + const token = c.req.header('Authorization') + + if (!token) { + return c.json({ error: 'Unauthorized' }, 401) + } + + await next() +} + +// Route with middleware +const protectedRoute = app.get('/protected', authMiddleware, (c) => { + return c.json({ data: 'Protected data' }) +}) + +// Export type includes middleware responses +export type ProtectedType = typeof protectedRoute + +// ============================================================================ +// QUERY PARAMETER HANDLING +// ============================================================================ + +const searchQuerySchema = z.object({ + q: z.string(), + page: z.string().transform((val) => parseInt(val, 10)), +}) + +const searchRoute = app.get('/search', zValidator('query', searchQuerySchema), (c) => { + const { q, page } = c.req.valid('query') + + return c.json({ + query: q, + page, + results: [], + }) +}) + +export type SearchType = typeof searchRoute + +// ============================================================================ +// EXPORT MAIN APP +// ============================================================================ + +export default app diff --git a/templates/validation-valibot.ts b/templates/validation-valibot.ts new file mode 100644 index 0000000..09e575d --- /dev/null +++ b/templates/validation-valibot.ts @@ -0,0 +1,315 @@ +/** + * Hono Validation with Valibot + * + * Complete examples for request validation using Valibot validator. + * Valibot is lighter and faster than Zod, with modular imports. + */ + +import { Hono } from 'hono' +import { vValidator } from '@hono/valibot-validator' +import * as v from 'valibot' +import { HTTPException } from 'hono/http-exception' + +const app = new Hono() + +// ============================================================================ +// BASIC VALIDATION +// ============================================================================ + +// JSON body validation +const userSchema = v.object({ + name: v.pipe(v.string(), v.minLength(1), v.maxLength(100)), + email: v.pipe(v.string(), v.email()), + age: v.optional(v.pipe(v.number(), v.integer(), v.minValue(18))), +}) + +app.post('/users', vValidator('json', userSchema), (c) => { + const data = c.req.valid('json') // Type-safe! + + return c.json({ + success: true, + data, + }) +}) + +// ============================================================================ +// QUERY PARAMETER VALIDATION +// ============================================================================ + +const searchSchema = v.object({ + q: v.pipe(v.string(), v.minLength(1)), + page: v.pipe(v.string(), v.transform(Number), v.number(), v.integer(), v.minValue(1)), + limit: v.optional( + v.pipe(v.string(), v.transform(Number), v.number(), v.integer(), v.minValue(1), v.maxValue(100)), + '10' + ), + sort: v.optional(v.picklist(['name', 'date', 'relevance'])), +}) + +app.get('/search', vValidator('query', searchSchema), (c) => { + const { q, page, limit, sort } = c.req.valid('query') + + return c.json({ + query: q, + page, + limit, + sort, + results: [], + }) +}) + +// ============================================================================ +// ROUTE PARAMETER VALIDATION +// ============================================================================ + +// UUID parameter +const uuidParamSchema = v.object({ + id: v.pipe(v.string(), v.uuid()), +}) + +app.get('/users/:id', vValidator('param', uuidParamSchema), (c) => { + const { id } = c.req.valid('param') + + return c.json({ + userId: id, + name: 'John Doe', + }) +}) + +// Numeric ID parameter +const numericIdSchema = v.object({ + id: v.pipe(v.string(), v.transform(Number), v.number(), v.integer(), v.minValue(1)), +}) + +app.get('/posts/:id', vValidator('param', numericIdSchema), (c) => { + const { id } = c.req.valid('param') // Type: number + + return c.json({ + postId: id, + title: 'Post Title', + }) +}) + +// ============================================================================ +// HEADER VALIDATION +// ============================================================================ + +const headerSchema = v.object({ + 'authorization': v.pipe(v.string(), v.startsWith('Bearer ')), + 'content-type': v.literal('application/json'), + 'x-api-version': v.optional(v.picklist(['1.0', '2.0'])), +}) + +app.post('/auth', vValidator('header', headerSchema), (c) => { + const headers = c.req.valid('header') + + return c.json({ + authenticated: true, + apiVersion: headers['x-api-version'] || '1.0', + }) +}) + +// ============================================================================ +// CUSTOM VALIDATION HOOKS +// ============================================================================ + +const customErrorSchema = v.object({ + email: v.pipe(v.string(), v.email()), + age: v.pipe(v.number(), v.integer(), v.minValue(18)), +}) + +app.post( + '/register', + vValidator('json', customErrorSchema, (result, c) => { + if (!result.success) { + return c.json( + { + error: 'Validation failed', + issues: result.issues, + }, + 400 + ) + } + }), + (c) => { + const data = c.req.valid('json') + return c.json({ success: true, data }) + } +) + +// ============================================================================ +// COMPLEX SCHEMA VALIDATION +// ============================================================================ + +const addressSchema = v.object({ + street: v.string(), + city: v.string(), + zipCode: v.pipe(v.string(), v.regex(/^\d{5}$/)), + country: v.pipe(v.string(), v.length(2)), +}) + +const profileSchema = v.object({ + name: v.string(), + email: v.pipe(v.string(), v.email()), + address: addressSchema, + tags: v.pipe(v.array(v.string()), v.minLength(1), v.maxLength(5)), +}) + +app.post('/profile', vValidator('json', profileSchema), (c) => { + const data = c.req.valid('json') + + return c.json({ + success: true, + profile: data, + }) +}) + +// ============================================================================ +// DISCRIMINATED UNION +// ============================================================================ + +const paymentSchema = v.variant('method', [ + v.object({ + method: v.literal('card'), + cardNumber: v.pipe(v.string(), v.regex(/^\d{16}$/)), + cvv: v.pipe(v.string(), v.regex(/^\d{3}$/)), + }), + v.object({ + method: v.literal('paypal'), + email: v.pipe(v.string(), v.email()), + }), + v.object({ + method: v.literal('bank'), + accountNumber: v.string(), + routingNumber: v.string(), + }), +]) + +app.post('/payment', vValidator('json', paymentSchema), (c) => { + const payment = c.req.valid('json') + + if (payment.method === 'card') { + console.log('Processing card payment:', payment.cardNumber) + } + + return c.json({ success: true }) +}) + +// ============================================================================ +// TRANSFORMATIONS +// ============================================================================ + +const eventSchema = v.object({ + name: v.string(), + startDate: v.pipe(v.string(), v.transform((val) => new Date(val))), + endDate: v.pipe(v.string(), v.transform((val) => new Date(val))), + capacity: v.pipe(v.string(), v.transform(Number), v.number(), v.integer(), v.minValue(1)), +}) + +app.post('/events', vValidator('json', eventSchema), (c) => { + const event = c.req.valid('json') + + return c.json({ + success: true, + event: { + ...event, + startDate: event.startDate.toISOString(), + endDate: event.endDate.toISOString(), + }, + }) +}) + +// ============================================================================ +// OPTIONAL AND DEFAULT VALUES +// ============================================================================ + +const settingsSchema = v.object({ + theme: v.optional(v.picklist(['light', 'dark']), 'light'), + notifications: v.optional(v.boolean()), + language: v.optional(v.string(), 'en'), + maxResults: v.optional(v.pipe(v.number(), v.integer(), v.minValue(1), v.maxValue(100)), 10), +}) + +app.post('/settings', vValidator('json', settingsSchema), (c) => { + const settings = c.req.valid('json') + + return c.json({ + success: true, + settings, + }) +}) + +// ============================================================================ +// ARRAY VALIDATION +// ============================================================================ + +const batchCreateSchema = v.object({ + users: v.pipe( + v.array( + v.object({ + name: v.string(), + email: v.pipe(v.string(), v.email()), + }) + ), + v.minLength(1), + v.maxLength(100) + ), +}) + +app.post('/batch-users', vValidator('json', batchCreateSchema), (c) => { + const { users } = c.req.valid('json') + + return c.json({ + success: true, + count: users.length, + users, + }) +}) + +// ============================================================================ +// PARTIAL SCHEMAS +// ============================================================================ + +const updateUserSchema = v.partial(userSchema) + +app.patch('/users/:id', vValidator('json', updateUserSchema), (c) => { + const updates = c.req.valid('json') + + return c.json({ + success: true, + updated: updates, + }) +}) + +// ============================================================================ +// UNION TYPES +// ============================================================================ + +const contentSchema = v.variant('type', [ + v.object({ type: v.literal('text'), content: v.string() }), + v.object({ type: v.literal('image'), url: v.pipe(v.string(), v.url()) }), + v.object({ type: v.literal('video'), videoId: v.string() }), +]) + +app.post('/content', vValidator('json', contentSchema), (c) => { + const content = c.req.valid('json') + + return c.json({ + success: true, + contentType: content.type, + }) +}) + +// ============================================================================ +// EXPORT +// ============================================================================ + +export default app + +export { + userSchema, + searchSchema, + uuidParamSchema, + profileSchema, + paymentSchema, +} diff --git a/templates/validation-zod.ts b/templates/validation-zod.ts new file mode 100644 index 0000000..ea1d817 --- /dev/null +++ b/templates/validation-zod.ts @@ -0,0 +1,428 @@ +/** + * Hono Validation with Zod + * + * Complete examples for request validation using Zod validator. + */ + +import { Hono } from 'hono' +import { zValidator } from '@hono/zod-validator' +import { z } from 'zod' +import { HTTPException } from 'hono/http-exception' + +const app = new Hono() + +// ============================================================================ +// BASIC VALIDATION +// ============================================================================ + +// JSON body validation +const userSchema = z.object({ + name: z.string().min(1).max(100), + email: z.string().email(), + age: z.number().int().min(18).optional(), +}) + +app.post('/users', zValidator('json', userSchema), (c) => { + const data = c.req.valid('json') // Type-safe! { name: string, email: string, age?: number } + + return c.json({ + success: true, + data, + }) +}) + +// ============================================================================ +// QUERY PARAMETER VALIDATION +// ============================================================================ + +// Search query validation +const searchSchema = z.object({ + q: z.string().min(1), + page: z.string().transform((val) => parseInt(val, 10)).pipe(z.number().int().min(1)), + limit: z + .string() + .transform((val) => parseInt(val, 10)) + .pipe(z.number().int().min(1).max(100)) + .optional() + .default('10'), + sort: z.enum(['name', 'date', 'relevance']).optional(), +}) + +app.get('/search', zValidator('query', searchSchema), (c) => { + const { q, page, limit, sort } = c.req.valid('query') + // All types inferred correctly! + + return c.json({ + query: q, + page, + limit, + sort, + results: [], + }) +}) + +// ============================================================================ +// ROUTE PARAMETER VALIDATION +// ============================================================================ + +// UUID parameter validation +const uuidParamSchema = z.object({ + id: z.string().uuid(), +}) + +app.get('/users/:id', zValidator('param', uuidParamSchema), (c) => { + const { id } = c.req.valid('param') // Type: string (validated UUID) + + return c.json({ + userId: id, + name: 'John Doe', + }) +}) + +// Numeric ID parameter +const numericIdSchema = z.object({ + id: z.string().transform((val) => parseInt(val, 10)).pipe(z.number().int().positive()), +}) + +app.get('/posts/:id', zValidator('param', numericIdSchema), (c) => { + const { id } = c.req.valid('param') // Type: number + + return c.json({ + postId: id, + title: 'Post Title', + }) +}) + +// ============================================================================ +// HEADER VALIDATION +// ============================================================================ + +const headerSchema = z.object({ + 'authorization': z.string().startsWith('Bearer '), + 'content-type': z.literal('application/json'), + 'x-api-version': z.enum(['1.0', '2.0']).optional(), +}) + +app.post('/auth', zValidator('header', headerSchema), (c) => { + const headers = c.req.valid('header') + + return c.json({ + authenticated: true, + apiVersion: headers['x-api-version'] || '1.0', + }) +}) + +// ============================================================================ +// FORM DATA VALIDATION +// ============================================================================ + +const formSchema = z.object({ + username: z.string().min(3), + password: z.string().min(8), + remember: z.enum(['on', 'off']).optional(), +}) + +app.post('/login', zValidator('form', formSchema), (c) => { + const { username, password, remember } = c.req.valid('form') + + return c.json({ + loggedIn: true, + username, + rememberMe: remember === 'on', + }) +}) + +// ============================================================================ +// CUSTOM VALIDATION HOOKS +// ============================================================================ + +// Custom error response +const customErrorSchema = z.object({ + email: z.string().email(), + age: z.number().int().min(18), +}) + +app.post( + '/register', + zValidator('json', customErrorSchema, (result, c) => { + if (!result.success) { + return c.json( + { + error: 'Validation failed', + issues: result.error.issues.map((issue) => ({ + path: issue.path.join('.'), + message: issue.message, + })), + }, + 400 + ) + } + }), + (c) => { + const data = c.req.valid('json') + return c.json({ success: true, data }) + } +) + +// Throw HTTPException on validation failure +app.post( + '/submit', + zValidator('json', userSchema, (result, c) => { + if (!result.success) { + throw new HTTPException(400, { + message: 'Validation error', + cause: result.error, + }) + } + }), + (c) => { + const data = c.req.valid('json') + return c.json({ success: true, data }) + } +) + +// ============================================================================ +// COMPLEX SCHEMA VALIDATION +// ============================================================================ + +// Nested objects +const addressSchema = z.object({ + street: z.string(), + city: z.string(), + zipCode: z.string().regex(/^\d{5}$/), + country: z.string().length(2), +}) + +const profileSchema = z.object({ + name: z.string(), + email: z.string().email(), + address: addressSchema, + tags: z.array(z.string()).min(1).max(5), +}) + +app.post('/profile', zValidator('json', profileSchema), (c) => { + const data = c.req.valid('json') + // Fully typed nested structure! + + return c.json({ + success: true, + profile: data, + }) +}) + +// ============================================================================ +// CONDITIONAL VALIDATION +// ============================================================================ + +// Discriminated union +const paymentSchema = z.discriminatedUnion('method', [ + z.object({ + method: z.literal('card'), + cardNumber: z.string().regex(/^\d{16}$/), + cvv: z.string().regex(/^\d{3}$/), + }), + z.object({ + method: z.literal('paypal'), + email: z.string().email(), + }), + z.object({ + method: z.literal('bank'), + accountNumber: z.string(), + routingNumber: z.string(), + }), +]) + +app.post('/payment', zValidator('json', paymentSchema), (c) => { + const payment = c.req.valid('json') + + // TypeScript knows the shape based on payment.method + if (payment.method === 'card') { + console.log('Processing card payment:', payment.cardNumber) + } + + return c.json({ success: true }) +}) + +// ============================================================================ +// REFINEMENTS AND CUSTOM VALIDATION +// ============================================================================ + +// Custom validation logic +const passwordSchema = z.object({ + password: z.string().min(8), + confirmPassword: z.string(), +}).refine((data) => data.password === data.confirmPassword, { + message: 'Passwords do not match', + path: ['confirmPassword'], +}) + +app.post('/change-password', zValidator('json', passwordSchema), (c) => { + const data = c.req.valid('json') + + return c.json({ + success: true, + message: 'Password changed', + }) +}) + +// ============================================================================ +// TRANSFORMATION AND COERCION +// ============================================================================ + +// Transform strings to dates +const eventSchema = z.object({ + name: z.string(), + startDate: z.string().transform((val) => new Date(val)), + endDate: z.string().transform((val) => new Date(val)), + capacity: z.string().transform((val) => parseInt(val, 10)).pipe(z.number().int().positive()), +}) + +app.post('/events', zValidator('json', eventSchema), (c) => { + const event = c.req.valid('json') + // event.startDate is Date, not string! + + return c.json({ + success: true, + event: { + ...event, + startDate: event.startDate.toISOString(), + endDate: event.endDate.toISOString(), + }, + }) +}) + +// ============================================================================ +// OPTIONAL AND DEFAULT VALUES +// ============================================================================ + +const settingsSchema = z.object({ + theme: z.enum(['light', 'dark']).default('light'), + notifications: z.boolean().optional(), + language: z.string().default('en'), + maxResults: z.number().int().min(1).max(100).default(10), +}) + +app.post('/settings', zValidator('json', settingsSchema), (c) => { + const settings = c.req.valid('json') + // Default values applied if not provided + + return c.json({ + success: true, + settings, + }) +}) + +// ============================================================================ +// ARRAY VALIDATION +// ============================================================================ + +const batchCreateSchema = z.object({ + users: z.array( + z.object({ + name: z.string(), + email: z.string().email(), + }) + ).min(1).max(100), +}) + +app.post('/batch-users', zValidator('json', batchCreateSchema), (c) => { + const { users } = c.req.valid('json') + + return c.json({ + success: true, + count: users.length, + users, + }) +}) + +// ============================================================================ +// MULTIPLE VALIDATORS +// ============================================================================ + +// Validate multiple targets +const headerAuthSchema = z.object({ + authorization: z.string().startsWith('Bearer '), +}) + +const bodyDataSchema = z.object({ + data: z.string(), +}) + +app.post( + '/protected', + zValidator('header', headerAuthSchema), + zValidator('json', bodyDataSchema), + (c) => { + const headers = c.req.valid('header') + const body = c.req.valid('json') + + return c.json({ + authenticated: true, + data: body.data, + }) + } +) + +// ============================================================================ +// PARTIAL AND PICK SCHEMAS +// ============================================================================ + +// Update endpoint - make all fields optional +const updateUserSchema = userSchema.partial() + +app.patch('/users/:id', zValidator('json', updateUserSchema), (c) => { + const updates = c.req.valid('json') + // All fields are optional + + return c.json({ + success: true, + updated: updates, + }) +}) + +// Pick specific fields +const loginSchema = userSchema.pick({ email: true }) + +app.post('/login', zValidator('json', loginSchema), (c) => { + const { email } = c.req.valid('json') + + return c.json({ + success: true, + email, + }) +}) + +// ============================================================================ +// UNION AND INTERSECTION +// ============================================================================ + +// Union types (either/or) +const contentSchema = z.union([ + z.object({ type: z.literal('text'), content: z.string() }), + z.object({ type: z.literal('image'), url: z.string().url() }), + z.object({ type: z.literal('video'), videoId: z.string() }), +]) + +app.post('/content', zValidator('json', contentSchema), (c) => { + const content = c.req.valid('json') + + return c.json({ + success: true, + contentType: content.type, + }) +}) + +// ============================================================================ +// EXPORT +// ============================================================================ + +export default app + +// Export schemas for reuse +export { + userSchema, + searchSchema, + uuidParamSchema, + profileSchema, + paymentSchema, +}