104 lines
2.5 KiB
Markdown
104 lines
2.5 KiB
Markdown
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# Router
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A lean and mean http router for [node.js](http://nodejs.org).
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It is available through npm:
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npm install router
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## Usage
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Router does one thing and one thing only - route http requests.
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``` js
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var http = require('http');
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var router = require('router');
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var route = router();
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route.get('/', function(req, res) {
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res.writeHead(200);
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res.end('hello index page');
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});
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http.createServer(route).listen(8080); // start the server on port 8080
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```
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If you want to grap a part of the path you can use capture groups in the pattern:
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``` js
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route.get('/{base}', function(req, res) {
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var base = req.params.base; // ex: if the path is /foo/bar, then base = foo
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});
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```
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The capture patterns matches until the next `/` or character present after the group
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``` js
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route.get('/{x}x{y}', function(req, res) {
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// if the path was /200x200, then req.params = {x:'200', y:'200'}
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});
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```
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Optional patterns are supported by adding a `?` at the end
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``` js
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route.get('/{prefix}?/{top}', function(req, res) {
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// matches both '/a/b' and '/b'
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});
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```
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If you want to just match everything you can use a wildcard `*` which works like unix wildcards
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``` js
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route.get('/{prefix}/*', function(req, res) {
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// matches both '/a/', '/a/b', 'a/b/c' and so on.
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// the value of the wildcard is available through req.params.wildcard
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});
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```
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If the standard capture groups aren't expressive enough for you can specify an optional inline regex
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``` js
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route.get('/{digits}([0-9]+)', function(req, res) {
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// matches both '/24' and '/424' but not '/abefest' and so on.
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});
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```
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You can also use regular expressions and the related capture groups instead:
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``` js
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route.get(/^\/foo\/(\w+)/, function(req, res) {
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var group = req.params[1]; // if path is /foo/bar, then group is bar
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});
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```
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## Methods
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* `route.get`: Match `GET` requests
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* `route.post`: Match `POST` requests
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* `route.put`: Match `PUT` requests
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* `route.head`: Match `HEAD` requests
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* `route.del`: Match `DELETE` requests
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* `route.options`: Match `OPTIONS` requests
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* `route.all`: Match all above request methods.
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## Error handling
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By default Router will return 404 if you no route matched. If you want to do your own thing you can give it a callback:
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``` js
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route(req, res, function() {
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// no route was matched
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res.writeHead(404);
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res.end();
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});
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```
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You can also provide a catch-all to a given route that is called if no route was matched:
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``` js
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route.get(function(req, res) {
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// called if no other get route matched
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res.writeHead(404);
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res.end('no GET handler found');
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});
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```
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