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English · 日本語

Hono - [炎] means flame🔥 in Japanese - is a small, simple, and ultrafast web framework for Cloudflare Workers and Service Worker based serverless such as Fastly Compute@Edge.

import { Hono } from 'hono'
const app = new Hono()

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

app.fire()

Features

Ultrafast - the router does not use linear loops.
Zero-dependencies - using only Service Worker and Web standard API.
Middleware - built-in middleware and ability to extend with your own middleware.
TypeScript - first-class TypeScript support.
Optimized - for Cloudflare Workers and Fastly Compute@Edge.

Benchmark

Hono is fastest, compared to other routers for Cloudflare Workers.

hono x 809,503 ops/sec ±6.94% (73 runs sampled)
itty-router x 157,310 ops/sec ±4.31% (87 runs sampled)
sunder x 328,350 ops/sec ±2.30% (95 runs sampled)
worktop x 209,758 ops/sec ±4.28% (83 runs sampled)
Fastest is hono
✨  Done in 60.66s.

Hono in 1 minute

A demonstration to create an application for Cloudflare Workers with Hono.

Not only fast

Hono is fast. But not only fast.

Write Less, do more

Built-in middleware make "Write Less, do more" in reality. You can use a lot of middleware without writing code from scratch. Below are examples.

Basic Authentication
Cookie parsing / serializing
CORS
ETag
GraphQL Server
Logger
Mustache template engine (Only for Cloudflare Workers)
JSON pretty printing
Serving static files (Only for Cloudflare Workers)

You can enable logger and CORS middleware with just this code.

import { Hono } from 'hono'
import { cors } from 'hono/cors'
import { logger } from 'hono/logger'

const app = new Hono()
app.use('*', cors()).use(logger())

Developer Experience

And Hono provides fine "Developer Experience". Easy access to Request/Response thanks to the Context object. Above all, Hono is written in TypeScript. So, Hono has "Types"!

For example, the named path parameters will be literal types.

Install

You can install Hono from the npm registry.

yarn add hono

npm install hono

Methods

An instance of Hono has these methods.

app.HTTP_METHOD([path,] handler)
app.all([path,] handler)
app.route(path)
app.use([path,] middleware)
app.notFound(handler)
app.onError(err, handler)
app.fire()
app.fetch(request, env, event)
app.request(path, option)

Routing

Basic

// HTTP Methods
app.get('/', (c) => c.text('GET /'))
app.post('/', (c) => c.text('POST /'))

// Wildcard
app.get('/wild/*/card', (c) => {
  return c.text('GET /wild/*/card')
})

// Any HTTP methods
app.all('/hello', (c) => c.text('Any Method /hello'))

Named Parameter

app.get('/user/:name', (c) => {
  const name = c.req.param('name')
  ...
})

Regexp

app.get('/post/:date{[0-9]+}/:title{[a-z]+}', (c) => {
  const date = c.req.param('date')
  const title = c.req.param('title')
  ...
})

Chained route

app
  .get('/endpoint', (c) => {
    return c.text('GET /endpoint')
  })
  .post((c) => {
    return c.text('POST /endpoint')
  })
  .delete((c) => {
    return c.text('DELETE /endpoint')
  })

Nested route

const book = app.route('/book')
book.get('/', (c) => c.text('List Books')) // GET /book
book.get('/:id', (c) => {
  // GET /book/:id
  const id = c.req.param('id')
  return c.text('Get Book: ' + id)
})
book.post('/', (c) => c.text('Create Book')) // POST /book

no strict

If strict is set false, /helloand/hello/ are treated the same.

const app = new Hono({ strict: false }) // Default is true

app.get('/hello', (c) => c.text('/hello or /hello/'))

async/await

app.get('/fetch-url', async (c) => {
  const response = await fetch('https://example.com/')
  return c.text(`Status is ${response.status}`)
})

Middleware

Built-in Middleware

Hono has built-in middleware.

import { Hono } from 'hono'
import { poweredBy } from 'hono/powered-by'
import { logger } from 'hono/logger'
import { basicAuth } from 'hono/basicAuth'

const app = new Hono()

app.use('*', poweredBy())
app.use('*', logger())
// Or you can write:
// app.use('*', poweredBy()).use(logger())

app.use(
  '/auth/*',
  basicAuth({
    username: 'hono',
    password: 'acoolproject',
  })
)

Available built-in middleware is listed on src/middleware.

Custom Middleware

You can write your own middleware.

// Custom logger
app.use('*', async (c, next) => {
  console.log(`[${c.req.method}] ${c.req.url}`)
  await next()
})

// Add a custom header
app.use('/message/*', async (c, next) => {
  await next()
  c.header('x-message', 'This is middleware!')
})

app.get('/message/hello', (c) => c.text('Hello Middleware!'))

Not Found

app.notFound for customizing Not Found Response.

app.notFound((c) => {
  return c.text('Custom 404 Message', 404)
})

Error Handling

app.onError handle the error and return the customized Response.

app.onError((err, c) => {
  console.error(`${err}`)
  return c.text('Custom Error Message', 500)
})

Context

To handle Request and Reponse, you can use Context object.

c.req

// Get Request object
app.get('/hello', (c) => {
  const userAgent = c.req.headers.get('User-Agent')
  ...
})

// Shortcut to get a header value
app.get('/shortcut', (c) => {
  const userAgent = c.req.header('User-Agent')
  ...
})

// Query params
app.get('/search', (c) => {
  const query = c.req.query('q')
  ...
})

// Captured params
app.get('/entry/:id', (c) => {
  const id = c.req.param('id')
  ...
})

Shortcuts for Response

app.get('/welcome', (c) => {
  // Set headers
  c.header('X-Message', 'Hello!')
  c.header('Content-Type', 'text/plain')
  // Set HTTP status code
  c.status(201)
  // Return the response body
  return c.body('Thank you for comming')
})

The Response is the same as below.

new Response('Thank you for comming', {
  status: 201,
  statusText: 'Created',
  headers: {
    'X-Message': 'Hello',
    'Content-Type': 'text/plain',
    'Content-Length': '22',
  },
})

c.text()

Render text as Content-Type:text/plain.

app.get('/say', (c) => {
  return c.text('Hello!')
})

c.json()

Render JSON as Content-Type:application/json.

app.get('/api', (c) => {
  return c.json({ message: 'Hello!' })
})

c.html()

Render HTML as Content-Type:text/html.

app.get('/', (c) => {
  return c.html('<h1>Hello! Hono!</h1>')
})

c.notFound()

Return the Not Found Response.

app.get('/notfound', (c) => {
  return c.notFound()
})

c.redirect()

Redirect, default status code is 302.

app.get('/redirect', (c) => c.redirect('/'))
app.get('/redirect-permanently', (c) => c.redirect('/', 301))

c.res

// Response object
app.use('/', (c, next) => {
  next()
  c.res.headers.append('X-Debug', 'Debug message')
})

c.event

// FetchEvent object
app.use('*', async (c, next) => {
  c.event.waitUntil(
    ...
  )
  await next()
})

c.env

// Environment object for Cloudflare Workers
app.get('*', async c => {
  const counter = c.env.COUNTER
  ...
})

fire

app.fire() do this.

addEventListener('fetch', (event) => {
  event.respondWith(this.handleEvent(event))
})

fetch

app.fetch for Cloudflare Module Worker syntax.

export default {
  fetch(request: Request, env: Env, event: FetchEvent) {
    return app.fetch(request, env, event)
  },
}

/*
or just do:
export default app
*/

request

request is a useful method for testing.

test('GET /hello is ok', async () => {
  const res = await app.request('http://localhost/hello')
  expect(res.status).toBe(200)
})

Cloudflare Workers with Hono

Using Wrangler or Miniflare, you can develop the application locally and publish it with few commands.

Let's write your first code for Cloudflare Workers with Hono.

Caution

Wrangler 1.x does not support importing middleware. We recommend two ways:

Use Wragler 2.0 Beta.
Build without webpack 4.x. For example, you can use esbuild. See the starter template.

1. `npm init`

Make a npm skeleton directory.

mkdir hono-example
cd hono-example
npm init -y

2. `wrangler init`

Initialize as a wrangler project.

npx wrangler@beta init

Answer the questions. If you want, you can answer y.

Would you like to install wrangler into your package.json? (y/n) <--- n
Would you like to use TypeScript? (y/n) <--- n
Would you like to create a Worker at src/index.js? (y/n) <--- n

3. `npm install hono`

Install hono from the npm registry.

npm i hono

4. Write your app

Only 4 lines!!

// index.js
import { Hono } from 'hono'
const app = new Hono()

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

app.fire()

5. Run

Run the development server locally. Then, access http://127.0.0.1:8787/ in your Web browser.

npx wrangler@beta dev index.js

6. Publish

Deploy to Cloudflare. That's all!

npx wrangler@beta publish index.js

Starter template

You can start making your Cloudflare Workers application with the starter template. It is really minimal using TypeScript, esbuild, Miniflare, and Jest.

To generate a project skelton, run this command.

wrangler generate my-app https://github.com/honojs/hono-minimal

Implementation of the original router TrieRouter is inspired by goblin. RegExpRouter is inspired by Router::Boom. API design is inspired by express and koa. itty-router, Sunder, and worktop are the other routers or frameworks for Cloudflare Workers.

express https://github.com/expressjs/express
koa https://github.com/koajs/koa
itty-router https://github.com/kwhitley/itty-router
Sunder https://github.com/SunderJS/sunder
goblin https://github.com/bmf-san/goblin
worktop https://github.com/lukeed/worktop
Router::Boom https://github.com/tokuhirom/Router-Boom

Contributing

Contributions Welcome! You can contribute in the following ways.

Write or fix documents
Write code of middleware
Fix bugs
Refactor the code
etc.

Contributors

Thanks to all contributors!

Author

Yusuke Wada https://github.com/yusukebe

License

Distributed under the MIT License. See LICENSE for more information.

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