server.js

// Module dependencies
var express = require('express'), 
    path = require('path'), 
    http = require('http'), 
    twilio = require('twilio');

// Create Express web application
var app = express();

// Express configuration
app.configure(function(){
    app.set('port', process.env.PORT || 3000);
    app.set('views', __dirname + '/views');
    app.set('view engine', 'ejs');
    app.use(express.favicon());
    app.use(express.logger('dev'));
    app.use(express.bodyParser());
    app.use(express.methodOverride());
    app.use(app.router);
    app.use(express.static(path.join(__dirname, 'public')));
});
app.configure('development', function(){
    app.use(express.errorHandler());
});

// Capability token
app.get('/capability', function(request, response) {
    var capability = new twilio.Capability();
    capability.allowClientOutgoing('a twiml app SID for an outbound call');
    response.send(capability.generate());
});

// Start server
http.createServer(app).listen(app.get('port'), function(){
  console.log("Express server listening on port " + app.get('port'));
});