Choreographer

Your server is my stage -- dirt simple URL routing for Node.js. Easy to use, easy to understand. Sinatra-style API.

(This has been tested with Node.js v0.2.0-v0.4.8. Should work with all subsequent versions too.)

Install

Get npm if you don't already have it, and then just run npm install choreographer.

Usage

Dirt simple:

var http = require('http'),
  router = require('choreographer').router();

router.get('/chatroom/*/messages', function(req, res, room) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('No messages in ' + room + '.\n');
})
.post('/chatroom/*/message', function(req, res, room) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Posted message to ' + room + '.\n');
})
.notFound(function(req, res) {
  res.writeHead(404, {'Content-Type': 'text/plain'});
  res.end('404: This server is just a skeleton for a chat server.\n' +
    'I\'m afraid ' + req.url + ' cannot be found here.\n');
});

http.createServer(router).listen(80);

Routes are easily made case-insensitive with the optional ignoreCase flag:

router.get('/HelloWorld', true, function(req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Hello, World!\n');
});

Routes default to case-sensitive without the flag, but you can change that:

//routes defined up 'til now defaulted to case-sensitive if flag omitted
router.ignoreCase = true;
//routes defined following default to case-insensitive if flag omitted

A star * in a route matches anything up to a slash /, but if you want to match slashes too you can simply use two stars **:

router.get('/static/**', function(req, res, path) {
  serveStaticFiles(path); //path could be 'file.ext' or 'folders/file.ext'
});

Most flexibly, regular expressions may also be used as routes:

router.get(/^\/hw(\d+)$/i, function(req, res, hwNum) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Homework '+hwNum+' isn\'t available yet.\n');
});

There's also put, delete, head, trace, options, and connect, and that's it! That's the entire API, short and sweet.

As in Sinatra, routes are first-come, first-serve (only the callback for the first route to be matched by a request is invoked, and routes are matched in the order they are defined). Also as in Sinatra, creating get routes automatically creates head routes.

Choreographer has to parse the URL to match the routes (obviously). For convenience, the .parsedUrl property on the http.ServerRequest object is set to the parsed URL object so you needn't re-parse the URL (unless that property is already set to a parsed URL object, in which case, Choreographer will just use that object).

Notice that router is just an event listener for the request event on http.createServer, so if you want a listener that does more than routing:

http.createServer(function(req, res) {
  //do middleware stuff before routing
  router.apply(this, arguments);
  //do more stuff
}).listen(80);

Understanding The Code

The code is just as simple: first half is the router, second half is the routes. Lightweight and easy to understand.

The entire architecture is designed around the philosophy of being so simple it obviously has no bugs, rather than so complicated it has no obvious bugs.

Open-Source License

GNU Lesser General Public License