Cloudflare Workers Router

Cloudflare Workers Router is a super lightweight router (3.6 kB) with middleware support and ZERO dependencies for Cloudflare Workers, inspired by the Express.js syntax.

When I was trying out Cloudflare Workers I almost immediately noticed how fast it was compared to other serverless offerings. So I wanted to build a full-fledged API to see how it performs doing real work, but since I wasn't able to find a router that suited my needs I created my own.

I worked a lot with Express.js in the past and really enjoyed their middleware approach, but since none of the available Cloudflare Worker routers offered middleware support at the time, I felt the need to create this router.

Attention: It's not directly compatible with Express.js, it only follows the same approach.

Contents

• Usage
• Reference
• Setup

Usage

Simple Example

const Router = require('@tsndr/cloudflare-worker-router')
const router = new Router()

// Enabling buildin CORS support
router.cors()

// Register global middleware
router.use((req, res, next) => {
  res.headers.set('X-Global-Middlewares', 'true')
  next()
})

// Simple get
router.get('/user', (req, res) => {
  res.body = {
    data: {
      id: 1,
      name: 'John Doe'
    }
  }
})

// Post route with url parameter
router.post('/user/:id', (req, res) => {

  const userId = req.params.id
  
  // Do stuff...
  
  if (errorDoingStuff) {
    res.status = 400
    res.body = {
      error: 'User did stupid stuff!'
    }
    return
  }
  
  res.status = 204
})

// Delete route using a middleware
router.delete('/user/:id', (req, res, next) => {

  if (!apiTokenIsCorrect) {
    res.status = 401
    return
  }
  
  await next()
}, (req, res) => {

  const userId = req.params.id
  
  // Do stuff...
})

// Listen Cloudflare Workers Fetch Event
addEventListener('fetch', event => {
  event.respondWith(router.handle(event.request))
})

Reference

router.debug([state])

Enable or disable debug mode. Which will return the error.stack in case of an exception instead of and empty 500 response. Debug mode is disabled by default.

state

State is a boolean which determines if debug mode should be enabled or not (default: true)

router.use(handler)

Register a global middleware handler.

handler (function)

Handler is a function which will be called for every request.

router.cors([config])

If enabled will overwrite other OPTIONS requests.

config (object, optional)

router.any(url, [...handlers])

router.connect(url, [...handlers])

router.delete(url, [...handlers])

router.get(url, [...handlers])

router.head(url, [...handlers])

router.options(url, [...handlers])

router.patch(url, [...handlers])

router.post(url, [...handlers])

router.put(url, [...handlers])

router.trace(url, [...handlers])

url (string)

The URL starting with a /. Supports the use of dynamic parameters, prefixed with a : (i.e. /user/:userId/edit) which will be available through the req-Object (i.e. req.params.userId).

handlers (function, optional)

An unlimited number of functions getting req and res passed into them.

req-Object

res-Object

Setup

Wrangler

You can use wrangler to generate a new Cloudflare Workers project based on this router by running the following command from your terminal:

wrangler generate myapp https://github.com/tsndr/cloudflare-worker-router-template

Before publishing your code you need to edit wrangler.toml file and add your Cloudflare account_id - more information about publishing your code can be found in the documentation.

Once you are ready, you can publish your code by running the following command:

wrangler publish

You can also test it loacally by running the following command:

wrangler dev

npm

If you already have a wrangler project you can install the router like this:

npm i @tsndr/cloudflare-worker-router

Serverless

To deploy using serverless add a serverless.yml file.