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https://github.com/worker-tools/router

A router for Worker Runtimes such and Cloudflare Workers or Service Workers.
https://github.com/worker-tools/router

cloudflare cloudflare-workers http router routing

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A router for Worker Runtimes such and Cloudflare Workers or Service Workers.

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README 

        
# Worker Router

A router for [Worker Runtimes](https://workers.js.org) such as Cloudflare Workers and Service Workers.



This router is inspired by previous work, specifically `tiny-request-router` and `itty-router`, but it

improves on them by providing better support for middleware, type inference, nested routing, and broader URL matching for use in service workers.



## 🆓 Type Inference

The goal of Worker Router is to *infer types based on usage* so that **no explicit typing** is required for standard use cases.

This allows even JavaScript users to benefit from inline documentation and API discoverability. For example,



```js

const router = new WorkersRouter()

  .get('/about', basics(), (req, { userAgent }) => ok())

  .get('/login', unsignedCookies(), (req, { cookies }) => ok())

```



In this example your editor can infer the types and documentation for

  - `userAgent`, provided by the `basics` middleware 

  - `cookies`, provided by the `unsignedCookies` middleware 



## 🔋 Functional Middleware

Worker Router [middlewares](https://workers.tools/middleware) are *just function* that add properties to a generic context object. 

As such, they can be *mixed and matched* using standard tools from functional programming.



For convenience, this module provides a `combine` utility to combine multiple middlewares into one.



```js

const myReusableMW = combine(

  basics(), 

  signedCookies({ secret: 'password123' }), 

  cookieSession({ user: '' })

);



const router = new WorkersRouter()

  .get('/', myReusableMW, () => ok())

  .post('/', combine(myReusableMW, bodyParser()), () => ok())

```



Note that type inference is maintained when combining middleware!



## 🪆 Nested Routing

Worker Router supports delegating entire sub routes to another router:



```js

const itemRouter = new WorkerRouter()

  .get('/', (req, { params }) => ok(`Matched "/item/`))

  .get('/:id', (req, { params }) => ok(`Matched "/item/${params.id}`))



const router = new WorkersRouter()

  .get('/', () => ok('Main Page'))

  .use('/item*', itemRouter)

```



## ⚙️ Ready for Service... Worker

Internally, this router uses [`URLPattern`](https://web.dev/urlpattern/) for routing, which allows it match URLs in the broadest sense. 

For example, the following router, meant to be used in a Service Worker, can handle internal requests as well as intercept calls to external resources:



```js

// file: "sw.js"

const router = new WorkersRouter()

  .get('/', () => ok('Main Page'))

  .get('/about', () => ok('About Page'))

  .external('https://plausible.io/api/*', req => {

    // intercepted

  })

```



## 💥 Error Handling Without Even Trying

Worker Router has first class support for error handling. Its main purpose is to let you write your handlers without having to wrap everything inside a massive `try {} catch` block. Instead, you can define special recover routes that get invoked when something goes wrong. 



```js

const router = new WorkersRouter()

  .get('/', () => ok('Main Page'))

  .get('/about', () => { throw Error('bang') })

  .recover('*', (req, { error, response }) => 

    new Response(`Something went wrong: ${error.message}`, response)

  );

```



## ✅ Works with Workers

Worker Router comes with out of the box support for a variety of Worker Runtimes:



To use it in an environment that provides a global `fetch` event, use



```js

self.addEventListener('fetch', router)

```



(This works because the router implements the [`EventListener`](https://developer.mozilla.org/en-US/docs/Web/API/EventListener) interface)



To use it with Cloudflare's module workers, use



```js

export default router

```



(This works because the router implements a `fetch` method with compatible interface)



To use it with Deno/Deploy's `serve` function, use



```js

serve(router.serveCallback)

```







--------









This module is part of the Worker Tools collection
⁕



[Worker Tools](https://workers.tools) are a collection of TypeScript libraries for writing web servers in [Worker Runtimes](https://workers.js.org) such as Cloudflare Workers, Deno Deploy and Service Workers in the browser. 



If you liked this module, you might also like:



- 🧭 [__Worker Router__][router] --- Complete routing solution that works across CF Workers, Deno and Service Workers

- 🔋 [__Worker Middleware__][middleware] --- A suite of standalone HTTP server-side middleware with TypeScript support

- 📄 [__Worker HTML__][html] --- HTML templating and streaming response library

- 📦 [__Storage Area__][kv-storage] --- Key-value store abstraction across [Cloudflare KV][cloudflare-kv-storage], [Deno][deno-kv-storage] and browsers.

- 🆗 [__Response Creators__][response-creators] --- Factory functions for responses with pre-filled status and status text

- 🎏 [__Stream Response__][stream-response] --- Use async generators to build streaming responses for SSE, etc...

- 🥏 [__JSON Fetch__][json-fetch] --- Drop-in replacements for Fetch API classes with first class support for JSON.

- 🦑 [__JSON Stream__][json-stream] --- Streaming JSON parser/stingifier with first class support for web streams.



Worker Tools also includes a number of polyfills that help bridge the gap between Worker Runtimes:

- ✏️ [__HTML Rewriter__][html-rewriter] --- Cloudflare's HTML Rewriter for use in Deno, browsers, etc...

- 📍 [__Location Polyfill__][location-polyfill] --- A `Location` polyfill for Cloudflare Workers.

- 🦕 [__Deno Fetch Event Adapter__][deno-fetch-event-adapter] --- Dispatches global `fetch` events using Deno’s native HTTP server.



[router]: https://workers.tools/router

[middleware]: https://workers.tools/middleware

[html]: https://workers.tools/html

[kv-storage]: https://workers.tools/kv-storage

[cloudflare-kv-storage]: https://workers.tools/cloudflare-kv-storage

[deno-kv-storage]: https://workers.tools/deno-kv-storage

[kv-storage-polyfill]: https://workers.tools/kv-storage-polyfill

[response-creators]: https://workers.tools/response-creators

[stream-response]: https://workers.tools/stream-response

[json-fetch]: https://workers.tools/json-fetch

[json-stream]: https://workers.tools/json-stream

[request-cookie-store]: https://workers.tools/request-cookie-store

[extendable-promise]: https://workers.tools/extendable-promise

[html-rewriter]: https://workers.tools/html-rewriter

[location-polyfill]: https://workers.tools/location-polyfill

[deno-fetch-event-adapter]: https://workers.tools/deno-fetch-event-adapter



Fore more visit [workers.tools](https://workers.tools).