What it does
Hono is a lightweight web framework built on standard Request and Response objects. It provides routing, middleware, validation helpers, and a typed RPC client across multiple JavaScript runtimes.
Why it’s interesting
Web-standard interfaces make the core request handler portable. Its routing implementations and TypeScript inference are useful examples of balancing runtime performance with developer ergonomics.
Real-world use case
Build a Cloudflare Workers API and use its route types in a React or Next.js frontend. Validate inputs on the server while keeping client calls typed.
What I can learn
- 01
Routing algorithms
compare compiled regular-expression matching with other router strategies.
- 02
Runtime portability
separate Fetch-compatible handlers from runtime-specific adapters.
- 03
TypeScript inference
carry route parameters and response types into an RPC client.
One thing to explore
Regular-expression routing
Follow the implementation and connect it to the learning points above.
Explore the source (opens in a new tab)10-Minute Challenge
Add a parameterized JSON endpoint
Before you start: Node.js and npm; use the generated Cloudflare Workers project for this example.
- Create a Hono project and choose the Cloudflare Workers template. Install its dependencies.
- Add the route below to the generated app, keeping its export.
- Run npm run dev and request /api/users/123 at the URL printed by the dev server. Try a nonnumeric ID.
npm create hono@latest hono-democd hono-demonpm installapp.get('/api/users/:id', (c) => { const id = c.req.param('id') if (!/^\d+$/.test(id)) return c.json({ error: 'Expected a numeric ID' }, 400) return c.json({ userId: id, status: 'active' })})npm run dev