Hono

npm create hono@latest my-api
# Select: cloudflare-workers
cd my-api
npm install
npm run dev    # Wrangler local dev
npm run deploy # Deploy to Cloudflare

mkdir my-api && cd my-api
bun init
bun add hono

// src/index.ts (Bun)
import { Hono } from 'hono';

const app = new Hono();

app.get('/', c => c.text('Hello Hono!'));

export default {
  port: 3000,
  fetch: app.fetch,
};

import { Hono } from 'hono';

const app = new Hono();

// Basic methods
app.get('/posts', c => c.json({ posts: [] }));
app.post('/posts', c => c.json({ created: true }, 201));
app.put('/posts/:id', c => c.json({ updated: true }));
app.delete('/posts/:id', c => c.json({ deleted: true }));

// Route params and query strings
app.get('/posts/:id', async c => {
  const id = c.req.param('id');
  const format = c.req.query('format') ?? 'json';
  return c.json({ id, format });
});

// Wildcard
app.get('/static/*', c => c.text('static file'));

export default app;

app
  .get('/users', listUsers)
  .post('/users', createUser)
  .get('/users/:id', getUser)
  .patch('/users/:id', updateUser)
  .delete('/users/:id', deleteUser);

import { Hono } from 'hono';
import { logger } from 'hono/logger';
import { cors } from 'hono/cors';
import { bearerAuth } from 'hono/bearer-auth';

const app = new Hono();

// Built-in middleware
app.use('*', logger());
app.use('/api/*', cors({ origin: 'https://myapp.com' }));
app.use('/api/admin/*', bearerAuth({ token: process.env.API_TOKEN! }));

// Custom middleware
app.use('*', async (c, next) => {
  c.set('requestId', crypto.randomUUID());
  await next();
  c.header('X-Request-Id', c.get('requestId'));
});

app.post('/submit', async c => {
  // Parse body
  const body = await c.req.json<{ name: string; email: string }>();
  const form = await c.req.formData();
  const text = await c.req.text();

  // Headers and cookies
  const auth = c.req.header('authorization');
  const token = getCookie(c, 'session');

  // Responses
  return c.json({ ok: true });                        // JSON
  return c.text('hello');                             // plain text
  return c.html('<h1>Hello</h1>');                    // HTML
  return c.redirect('/dashboard', 302);              // redirect
  return new Response(stream, { status: 200 });       // raw Response
});

import { zValidator } from '@hono/zod-validator';
import { z } from 'zod';

const createPostSchema = z.object({
  title: z.string().min(1).max(200),
  body: z.string().min(1),
  tags: z.array(z.string()).default([]),
});

app.post(
  '/posts',
  zValidator('json', createPostSchema),
  async c => {
    const data = c.req.valid('json'); // fully typed
    const post = await db.post.create({ data });
    return c.json(post, 201);
  }
);

// src/routes/posts.ts
import { Hono } from 'hono';

const posts = new Hono();

posts.get('/', async c => { /* list posts */ });
posts.post('/', async c => { /* create post */ });
posts.get('/:id', async c => { /* get post */ });

export default posts;

// src/index.ts
import { Hono } from 'hono';
import posts from './routes/posts';
import users from './routes/users';

const app = new Hono().basePath('/api');

app.route('/posts', posts);
app.route('/users', users);

export default app;

// server: src/routes/posts.ts
import { Hono } from 'hono';
import { zValidator } from '@hono/zod-validator';
import { z } from 'zod';

const posts = new Hono()
  .get('/', c => c.json({ posts: [{ id: '1', title: 'Hello' }] }))
  .post(
    '/',
    zValidator('json', z.object({ title: z.string() })),
    async c => {
      const { title } = c.req.valid('json');
      return c.json({ id: '2', title }, 201);
    }
  );

export default posts;
export type PostsType = typeof posts;

// client: src/client.ts
import { hc } from 'hono/client';
import type { PostsType } from '../server/routes/posts';

const client = hc<PostsType>('/api/posts');

// Fully typed — autocomplete on routes, params, and responses
const { posts } = await client.$get().json();
const newPost = await client.$post({ json: { title: 'New Post' } }).json();

import { Hono } from 'hono';
import { jwt, sign } from 'hono/jwt';

const app = new Hono();
const SECRET = process.env.JWT_SECRET!;

app.post('/login', async c => {
  const { email, password } = await c.req.json();
  const user = await validateUser(email, password);
  if (!user) return c.json({ error: 'Invalid credentials' }, 401);

  const token = await sign({ sub: user.id, exp: Math.floor(Date.now() / 1000) + 3600 }, SECRET);
  return c.json({ token });
});

app.use('/api/*', jwt({ secret: SECRET }));
app.get('/api/me', async c => {
  const payload = c.get('jwtPayload');
  const user = await getUserById(payload.sub);
  return c.json(user);
});

export default app;

// src/index.ts
import { Hono } from 'hono';

type Bindings = {
  DB: D1Database;
  API_TOKEN: string;
};

const app = new Hono<{ Bindings: Bindings }>();

app.get('/users', async c => {
  const { results } = await c.env.DB.prepare('SELECT * FROM users LIMIT 50').all();
  return c.json(results);
});

app.post('/users', async c => {
  const { name, email } = await c.req.json();
  await c.env.DB.prepare('INSERT INTO users (name, email) VALUES (?, ?)')
    .bind(name, email)
    .run();
  return c.json({ created: true }, 201);
});

export default app;

import { stream, streamText } from 'hono/streaming';

app.get('/stream', c =>
  streamText(c, async stream => {
    for (const chunk of ['Hello', ' ', 'World']) {
      await stream.write(chunk);
      await stream.sleep(100);
    }
  })
);