cf-hono

Hono Framework on Cloudflare Workers

Setup

import { Hono } from 'hono';

type Bindings = {
  AI: Ai;
  FEED_CACHE: KVNamespace;
};

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

app.get('/health', (c) => c.text('OK'));
app.post('/summarize', async (c) => {
  const { text } = await c.req.json();
  const result = await c.env.AI.run('@cf/mistralai/mistral-small-3.1-24b-instruct', {
    messages: [{ role: 'user', content: `Summarize: ${text}` }]
  });
  return c.json(result);
});

export default app;

Key Patterns

• Typed bindings: Hono<{ Bindings: Bindings }> for type-safe c.env access
• Routing: app.get(), app.post(), app.route() for nested routes
• Middleware: app.use() for auth, CORS, logging
• Request validation: c.req.json(), c.req.query(), c.req.param()
• Error handling: app.onError() for global error handler

Reference

For detailed patterns, see references/hono.md.