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https://github.com/ZijianHe/koa-router

Router middleware for koa.
https://github.com/ZijianHe/koa-router

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Router middleware for koa.

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# koa-router



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> Router middleware for [koa](https://github.com/koajs/koa)



* 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.



## Migrating to 7 / Koa 2



- The API has changed to match the new promise-based middleware

  signature of koa 2. See the

  [koa 2.x readme](https://github.com/koajs/koa/tree/2.0.0-alpha.3) for more

  information.

- Middleware is now always run in the order declared by `.use()` (or `.get()`,

  etc.), which matches Express 4 API.



## Installation



Install using [npm](https://www.npmjs.org/):



```sh

npm install koa-router

```



## API Reference

  

* [koa-router](#module_koa-router)

    * [Router](#exp_module_koa-router--Router) ⏏

        * [new Router([opts])](#new_module_koa-router--Router_new)

        * _instance_

            * [.get|put|post|patch|delete|del](#module_koa-router--Router+get|put|post|patch|delete|del) ⇒ Router

            * [.routes](#module_koa-router--Router+routes) ⇒ function

            * [.use([path], middleware)](#module_koa-router--Router+use) ⇒ Router

            * [.prefix(prefix)](#module_koa-router--Router+prefix) ⇒ Router

            * [.allowedMethods([options])](#module_koa-router--Router+allowedMethods) ⇒ function

            * [.redirect(source, destination, [code])](#module_koa-router--Router+redirect) ⇒ Router

            * [.route(name)](#module_koa-router--Router+route) ⇒ Layer | false

            * [.url(name, params, [options])](#module_koa-router--Router+url) ⇒ String | Error

            * [.param(param, middleware)](#module_koa-router--Router+param) ⇒ Router

        * _static_

            * [.url(path, params)](#module_koa-router--Router.url) ⇒ String






### 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:



```javascript

var Koa = require('koa');

var Router = require('koa-router');



var app = new Koa();

var 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.



```javascript

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](https://github.com/pillarjs/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.



```javascript

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

 // ...

});



router.url('user', 3);

// => "/users/3"

```



#### Multiple middleware



Multiple middleware may be given:



```javascript

router.get(

  '/users/:id',

  (ctx, next) => {

    return User.findOne(ctx.params.id).then(function(user) {

      ctx.user = user;

      next();

    });

  },

  ctx => {

    console.log(ctx.user);

    // => { id: 17, name: "Alex" }

  }

);

```



### Nested routers



Nesting routers is supported:



```javascript

var forums = new Router();

var 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:



```javascript

var 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`.



```javascript

router.get('/:category/:title', (ctx, next) => {

  console.log(ctx.params);

  // => { category: 'programming', title: 'how-to-node' }

});

```



The [path-to-regexp](https://github.com/pillarjs/path-to-regexp) module is

used to convert paths to regular expressions.



**Kind**: instance property of [Router](#exp_module_koa-router--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](#exp_module_koa-router--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](#exp_module_koa-router--Router)  



| Param | Type |

| --- | --- |

| [path] | String | 

| middleware | function | 

| [...] | function | 



**Example**  

```javascript

// 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](#exp_module_koa-router--Router)  



| Param | Type |

| --- | --- |

| prefix | String | 



**Example**  

```javascript

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](#exp_module_koa-router--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**  

```javascript

var Koa = require('koa');

var Router = require('koa-router');



var app = new Koa();

var router = new Router();



app.use(router.routes());

app.use(router.allowedMethods());

```



**Example with [Boom](https://github.com/hapijs/boom)**



```javascript

var Koa = require('koa');

var Router = require('koa-router');

var Boom = require('boom');



var app = new Koa();

var 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.



```javascript

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

```



This is equivalent to:



```javascript

router.all('/login', ctx => {

  ctx.redirect('/sign-in');

  ctx.status = 301;

});

```



**Kind**: instance method of [Router](#exp_module_koa-router--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](#exp_module_koa-router--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](#exp_module_koa-router--Router)  



| Param | Type | Description |

| --- | --- | --- |

| name | String | route name |

| params | Object | url parameters |

| [options] | Object | options parameter |

| [options.query] | Object | String | query options |



**Example**  

```javascript

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](#exp_module_koa-router--Router)  



| Param | Type |

| --- | --- |

| param | String | 

| middleware | function | 



**Example**  

```javascript

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(function(friends) {

      ctx.body = friends;

    });

  })

  // /users/3 => {"id": 3, "name": "Alex"}

  // /users/3/friends => [{"id": 4, "name": "TJ"}]

```




#### Router.url(path, params [, options]) ⇒ String

Generate URL from url pattern and given `params`.



**Kind**: static method of [Router](#exp_module_koa-router--Router)  



| Param | Type | Description |

| --- | --- | --- |

| path | String | url pattern |

| params | Object | url parameters |

| [options] | Object | options parameter |

| [options.query] | Object | String | query options |



**Example**  

```javascript

var url = Router.url('/users/:id', {id: 1});

// => "/users/1"



const url = Router.url('/users/:id', {id: 1}, {query: { active: true }});

// => "/users/1?active=true"

```

## Contributing



Please submit all issues and pull requests to the [alexmingoia/koa-router](http://github.com/alexmingoia/koa-router) repository!



## Tests



Run tests using `npm test`.



## Support



If you have any problem or suggestion please open an issue [here](https://github.com/alexmingoia/koa-router/issues).