Node.js Adapter for Hono

This adapter @hono/node-server allows you to run your Hono application on Node.js. Initially, Hono wasn't designed for Node.js, but with this adapter, you can now use Hono on Node.js. It utilizes web standard APIs implemented in Node.js version 18 or higher.

Benchmarks

Hono is 3.5 times faster than Express.

Express:

$ bombardier -d 10s --fasthttp http://localhost:3000/

Statistics Avg Stdev Max Reqs/sec 16438.94 1603.39 19155.47 Latency 7.60ms 7.51ms 559.89ms HTTP codes: 1xx - 0, 2xx - 164494, 3xx - 0, 4xx - 0, 5xx - 0 others - 0 Throughput: 4.55MB/s

Hono + @hono/node-server:

$ bombardier -d 10s --fasthttp http://localhost:3000/

Statistics Avg Stdev Max Reqs/sec 58296.56 5512.74 74403.56 Latency 2.14ms 1.46ms 190.92ms HTTP codes: 1xx - 0, 2xx - 583059, 3xx - 0, 4xx - 0, 5xx - 0 others - 0 Throughput: 12.56MB/s

Requirements

It works on Node.js versions greater than 18.x. The specific required Node.js versions are as follows:

- 18.x => 18.14.1+

19.x => 19.7.0+
20.x => 20.0.0+
Essentially, you can simply use the latest version of each major release.
Installation
You can install it from the npm registry with npm command:
```
npm install @hono/node-server
```

Or use yarn:

yarn add @hono/node-server

Usage

Just import @hono/node-server at the top and write the code as usual. The same code that runs on Cloudflare Workers, Deno, and Bun will work.

import { serve } from '@hono/node-server'
import { Hono } from 'hono'
const app = new Hono()
app.get('/', (c) => c.text('Hono meets Node.js'))serve(app, (info) => {
  console.log(Listening on http://localhost:${info.port}) // Listening on http://localhost:3000
})

For example, run it using ts-node. Then an HTTP server will be launched. The default port is 3000.

ts-node ./index.ts

Open http://localhost:3000 with your browser.

Options

`port`

serve({
  fetch: app.fetch,
  port: 8787, // Port number, default is 3000
})

`createServer`

import { createServer } from 'node:https'
import fs from 'node:fs'
//...serve({
  fetch: app.fetch,
  createServer: createServer,
  serverOptions: {
    key: fs.readFileSync('test/fixtures/keys/agent1-key.pem'),
    cert: fs.readFileSync('test/fixtures/keys/agent1-cert.pem'),
  },
})

`overrideGlobalObjects`

The default value is true. The Node.js Adapter rewrites the global Request/Response and uses a lightweight Request/Response to improve performance. If you don't want to do that, set false.

serve({
  fetch: app.fetch,
  overrideGlobalObjects: false,
})

`autoCleanupIncoming`

The default value is true. The Node.js Adapter automatically cleans up (explicitly call destroy() method) if application is not finished to consume the incoming request. If you don't want to do that, set false.

If the application accepts connections from arbitrary clients, this cleanup must be done otherwise incomplete requests from clients may cause the application to stop responding. If your application only accepts connections from trusted clients, such as in a reverse proxy environment and there is no process that returns a response without reading the body of the POST request all the way through, you can improve performance by setting it to false.

serve({
  fetch: app.fetch,
  autoCleanupIncoming: false,
})

Middleware

Most built-in middleware also works with Node.js. Read the documentation and use the Middleware of your liking.

import { serve } from '@hono/node-server'
import { Hono } from 'hono'
import { prettyJSON } from 'hono/pretty-json'
const app = new Hono()
app.get('*', prettyJSON())
app.get('/', (c) => c.json({ 'Hono meets': 'Node.js' }))serve(app)

Serve Static Middleware

Use Serve Static Middleware that has been created for Node.js.

import { serveStatic } from '@hono/node-server/serve-static'
//...app.use('/static/*', serveStatic({ root: './' }))

If using a relative path, root will be relative to the current working directory from which the app was started.

This can cause confusion when running your application locally.

Imagine your project structure is:

my-hono-project/
  src/
    index.ts
  static/
    index.html

Typically, you would run your app from the project's root directory (my-hono-project), so you would need the following code to serve the static folder:

app.use('/static/*', serveStatic({ root: './static' }))

Notice that root here is not relative to src/index.ts, rather to my-hono-project.

Options

#### rewriteRequestPath

If you want to serve files in ./.foojs with the request path /__foo/*, you can write like the following.

app.use(
  '/__foo/*',
  serveStatic({
    root: './.foojs/',
    rewriteRequestPath: (path: string) => path.replace(/^\/__foo/, ''),
  })
)

#### onFound

You can specify handling when the requested file is found with onFound.

app.use(
  '/static/*',
  serveStatic({
    // ...
    onFound: (_path, c) => {
      c.header('Cache-Control', public, immutable, max-age=31536000)
    },
  })
)

#### onNotFound

The onNotFound is useful for debugging. You can write a handle for when a file is not found.

app.use(
  '/static/*',
  serveStatic({
    root: './non-existent-dir',
    onNotFound: (path, c) => {
      console.log(${path} is not found, request to ${c.req.path})
    },
  })
)

#### precompressed

The precompressed option checks if files with extensions like .br or .gz are available and serves them based on the Accept-Encoding header. It prioritizes Brotli, then Zstd, and Gzip. If none are available, it serves the original file.

app.use(
  '/static/*',
  serveStatic({
    precompressed: true,
  })
)

ConnInfo Helper

You can use the ConnInfo Helper by importing getConnInfo from @hono/node-server/conninfo.

import { getConnInfo } from '@hono/node-server/conninfo'app.get('/', (c) => {
  const info = getConnInfo(c) // info is ConnInfo
  return c.text(Your remote address is ${info.remote.address})
})

Accessing Node.js API

You can access the Node.js API from c.env in Node.js. For example, if you want to specify a type, you can write the following.

import { serve } from '@hono/node-server'
import type { HttpBindings } from '@hono/node-server'
import { Hono } from 'hono'
const app = new Hono<{ Bindings: HttpBindings }>()
app.get('/', (c) => {
  return c.json({
    remoteAddress: c.env.incoming.socket.remoteAddress,
  })
})serve(app)

The APIs that you can get from c.env are as follows.

type HttpBindings = {
  incoming: IncomingMessage
  outgoing: ServerResponse
}type Http2Bindings = {
  incoming: Http2ServerRequest
  outgoing: Http2ServerResponse
}

Direct response from Node.js API

You can directly respond to the client from the Node.js API. In that case, the response from Hono should be ignored, so return RESPONSE_ALREADY_SENT.

[!NOTE]

This feature can be used when migrating existing Node.js applications to Hono, but we recommend using Hono's API for new applications.

import { serve } from '@hono/node-server'
import type { HttpBindings } from '@hono/node-server'
import { RESPONSE_ALREADY_SENT } from '@hono/node-server/utils/response'
import { Hono } from 'hono'
const app = new Hono<{ Bindings: HttpBindings }>()
app.get('/', (c) => {
  const { outgoing } = c.env
  outgoing.writeHead(200, { 'Content-Type': 'text/plain' })
  outgoing.end('Hello World\n')
  return RESPONSE_ALREADY_SENT
})serve(app)

Listen to a UNIX domain socket

You can configure the HTTP server to listen to a UNIX domain socket instead of a TCP port.

import { createAdaptorServer } from '@hono/node-server'
// ...
const socketPath = '/tmp/example.sock'const server = createAdaptorServer(app)
server.listen(socketPath, () => {
  console.log(Listening on ${socketPath})
})

Related projects

- Hono -

Hono GitHub repository -
Authors
- Yusuke Wada
Taku Amano
License
MIT

📄 README.md

Node.js Adapter for Hono

Benchmarks

Requirements

Installation

Usage

Options

port

createServer

overrideGlobalObjects

autoCleanupIncoming

Middleware

Serve Static Middleware

Options

ConnInfo Helper

Accessing Node.js API

Direct response from Node.js API

Listen to a UNIX domain socket

Related projects

Authors

License

`port`

`createServer`

`overrideGlobalObjects`

`autoCleanupIncoming`