How can I respond to incoming Twilio calls and SMS messages using node.js?

When Twilio receives a call to your phone number, it will send an HTTP request to a URL you configure in the admin console:

What Twilio expects in return from this HTTP request is a set of XML instructions called TwiML that will tell Twilio what to do in response to the call. For example, let's say that you wanted to respond to a phone call by saying "thank you" and then playing a music file. If you wanted to do this in node, you might consider using this node library and the express framework to send a TwiML response:

var twilio = require('twilio'),    express = require('express');// Create express app with middleware to parse POST bodyvar app = express();app.use(express.urlencoded());// Create a route to respond to a callapp.post('/respondToVoiceCall', function(req, res) {    //Validate that this request really came from Twilio...    if (twilio.validateExpressRequest(req, 'YOUR_AUTH_TOKEN')) {        var twiml = new twilio.TwimlResponse();        twiml.say('Hi!  Thanks for checking out my app!')            .play('http://myserver.com/mysong.mp3');        res.type('text/xml');        res.send(twiml.toString());    }    else {        res.send('you are not twilio.  Buzz off.');    }});app.listen(process.env.PORT || 3000);

Good luck - hope this is what you were looking for.