koa-modern-router

DEPRECATED

I forked koa-router originally because it was sold to an unknown actor. The Koa org now has their own official fork, so I recommend using that instead.

---

Simple and modern router middleware for Koa. Based on koa-router.

IMPORTANT

It is not my goal to simply maintain koa-router under a new name. There may be breaking changes in the future. If you just want to keep using koa-router safely, you should npm i koa-router@7.4.0 and always use npm ci and save-exact=true in your .npmrc.

• Express-style routing using app.get, app.put, app.post, etc.
• Named URL parameters.
• Named routes with URL generation.
• Responds to OPTIONS requests with allowed methods.
• Support for 405 Method Not Allowed and 501 Not Implemented.
• Multiple route middleware.
• Multiple routers.
• Nestable routers.
• ES7 async/await support.

Installation

Install using npm:

npm i koa-modern-router

API Reference

• koa-modern-router
  • Router ⏏
    • new Router([opts])
    • instance
      • .get|put|post|patch|delete|del ⇒ Router
      • .routes ⇒ function
      • .use([path], middleware) ⇒ Router
      • .prefix(prefix) ⇒ Router
      • .allowedMethods([options]) ⇒ function
      • .redirect(source, destination, [code]) ⇒ Router
      • .route(name) ⇒ Layer | false
      • .url(name, params, [options]) ⇒ String | Error
      • .param(param, middleware) ⇒ Router
    • static
      • .url(path, params) ⇒ String
    • inner
      • ~sortByMostSpecificLayer(a, b)

Router ⏏

Kind: Exported class

new Router([opts])

Create a new router.

Param	Type	Description
[opts]	Object
[opts.prefix]	String	prefix router paths

Example
Basic usage:

const Koa = require('koa')
const Router = require('koa-modern-router')

const app = new Koa()
const router = new Router()

router.get('/', (ctx, next) => {
  // ctx.router available
})

app
  .use(router.routes()
  .use(router.allowedMethods())

router.get|put|post|patch|delete|del ⇒ Router

Create router.verb() methods, where verb is one of the HTTP verbs such as router.get() or router.post().

Match URL patterns to callback functions or controller actions using router.verb(), where verb is one of the HTTP verbs such as router.get() or router.post().

Additionaly, router.all() can be used to match against all methods.

router
  .get('/', (ctx, next) => {
    ctx.body = 'Hello World!'
  })
  .post('/users', (ctx, next) => {
    // ...
  })
  .put('/users/:id', (ctx, next) => {
    // ...
  })
  .del('/users/:id', (ctx, next) => {
    // ...
  })
  .all('/users/:id', (ctx, next) => {
    // ...
  })

When a route is matched, its path is available at ctx._matchedRoute and if named, the name is available at ctx._matchedRouteName

Route paths will be translated to regular expressions using path-to-regexp.

Query strings will not be considered when matching requests.

Named routes

Routes can optionally have names. This allows generation of URLs and easy renaming of URLs during development.

router.get('user', '/users/:id', (ctx, next) => {
 // ...
})

router.url('user', 3)
// => "/users/3"

Multiple middleware

Multiple middleware may be given:

router.get(
  '/users/:id',
  (ctx, next) => {
    return User.findOne(ctx.params.id).then((user) => {
      ctx.user = user
      next()
    })
  },
  ctx => {
    console.log(ctx.user)
    // => { id: 17, name: "Zac" }
  }
)

Nested routers

Nesting routers is supported:

const forums = new Router()
const posts = new Router()

posts.get('/', (ctx, next) => {...})
posts.get('/:pid', (ctx, next) => {...})
forums.use('/forums/:fid/posts', posts.routes(), posts.allowedMethods())

// responds to "/forums/123/posts" and "/forums/123/posts/123"
app.use(forums.routes())

Router prefixes

Route paths can be prefixed at the router level:

const router = new Router({
  prefix: '/users'
})

router.get('/', ...) // responds to "/users"
router.get('/:id', ...) // responds to "/users/:id"

URL parameters

Named route parameters are captured and added to ctx.params.

router.get('/:category/:title', (ctx, next) => {
  console.log(ctx.params)
  // => { category: 'programming', title: 'how-to-node' }
})

The path-to-regexp module is used to convert paths to regular expressions.

Kind: instance property of Router

Param	Type	Description
path	String
[middleware]	function	route middleware(s)
callback	function	route callback

router.routes ⇒ function

Returns router middleware which dispatches a route matching the request.

Kind: instance property of Router

router.use([path], middleware) ⇒ Router

Use given middleware.

Middleware run in the order they are defined by .use(). They are invoked sequentially, requests start at the first middleware and work their way "down" the middleware stack.

Kind: instance method of Router

Param	Type
[path]	String
middleware	function
[...]	function

Example

// session middleware will run before authorize
router
  .use(session())
  .use(authorize());

// use middleware only with given path
router.use('/users', userAuth())

// or with an array of paths
router.use(['/users', '/admin'], userAuth())

app.use(router.routes())

router.prefix(prefix) ⇒ Router

Set the path prefix for a Router instance that was already initialized.

Kind: instance method of Router

Param	Type
prefix	String

Example

router.prefix('/things/:thing_id')

router.allowedMethods([options]) ⇒ function

Returns separate middleware for responding to OPTIONS requests with an Allow header containing the allowed methods, as well as responding with 405 Method Not Allowed and 501 Not Implemented as appropriate.

Kind: instance method of Router

Param	Type	Description
[options]	Object
[options.throw]	Boolean	throw error instead of setting status and header
[options.notImplemented]	function	throw the returned value in place of the default NotImplemented error
[options.methodNotAllowed]	function	throw the returned value in place of the default MethodNotAllowed error

Example

const Koa = require('koa')
const Router = require('koa-modern-router')

const app = new Koa()
const router = new Router()

app.use(router.routes())
app.use(router.allowedMethods())

Example with Boom

const Koa = require('koa')
const Router = require('koa-modern-router')
const Boom = require('boom')

const app = new Koa()
const router = new Router()

app.use(router.routes())
app.use(router.allowedMethods({
  throw: true,
  notImplemented: () => new Boom.notImplemented(),
  methodNotAllowed: () => new Boom.methodNotAllowed()
}))

router.redirect(source, destination, [code]) ⇒ Router

Redirect source to destination URL with optional 30x status code.

Both source and destination can be route names.

router.redirect('/login', 'sign-in')

This is equivalent to:

router.all('/login', (ctx) => {
  ctx.redirect('/sign-in')
  ctx.status = 301
})

Kind: instance method of Router

Param	Type	Description
source	String	URL or route name.
destination	String	URL or route name.
[code]	Number	HTTP status code (default: 301).

router.route(name) ⇒ Layer | false

Lookup route with given name.

Kind: instance method of Router

Param	Type
name	String

router.url(name, params, [options]) ⇒ String | Error

Generate URL for route. Takes a route name and map of named params.

Kind: instance method of Router

Param	Type	Description
name	String	route name
params	Object	url parameters
[options]	Object	options parameter
[options.query]	Object | String	query options

Example

router.get('user', '/users/:id', (ctx, next) => {
  // ...
})

router.url('user', 3)
// => "/users/3"

router.url('user', { id: 3 })
// => "/users/3"

router.use((ctx, next) => {
  // redirect to named route
  ctx.redirect(ctx.router.url('sign-in'))
})

router.url('user', { id: 3 }, { query: { limit: 1 } })
// => "/users/3?limit=1"

router.url('user', { id: 3 }, { query: "limit=1" })
// => "/users/3?limit=1"

router.param(param, middleware) ⇒ Router

Run middleware for named route parameters. Useful for auto-loading or validation.

Kind: instance method of Router

Param	Type
param	String
middleware	function

Example

router
  .param('user', (id, ctx, next) => {
    ctx.user = users[id];
    if (!ctx.user) return ctx.status = 404
    return next()
  })
  .get('/users/:user', (ctx) => {
    ctx.body = ctx.user
  })
  .get('/users/:user/friends', (ctx) => {
    return ctx.user.getFriends().then((friends) => {
      ctx.body = friends
    })
  })
  // /users/3 => {"id": 3, "name": "Zac"}
  // /users/3/friends => [{"id": 4, "name": "TJ"}]

Router.url(path, params) ⇒ String

Generate URL from url pattern and given params.

Kind: static method of Router

Param	Type	Description
path	String	url pattern
params	Object	url parameters

Example

const url = Router.url('/users/:id', { id: 1 })
// => "/users/1"

Router~sortByMostSpecificLayer(a, b)

Sort function for array of Layers. Will sort the layers with least specific first and most specific last

Kind: inner method of Router

Param	Type
a	Layer
b	Layer

Patreon Sponsors

This project is sponsored on Patreon by:

• Keeley Hammond

Contributing

Please submit all issues and pull requests to the zacanger/koa-modern-router repository. See CONTRIBUTING.md for details.

License

MIT