index.js

const http = require('http');
const express = require('express');
const bodyParser = require('body-parser');
const MessagingResponse = require('twilio').twiml.MessagingResponse;

const app = express();
app.use(bodyParser.urlencoded({ extended: false });

app.post('/sms', (req, res) => {
  const twiml = new MessagingResponse();
  
  // Here is the from number and message body
  console.log(req.body.From);
  console.log(req.body.Body);

  const message = twiml.message();
  message.body('The Robots are coming! Head for the hills!');
  message.media('https://farm8.staticflickr.com/7090/6941316406_80b4d6d50e_z_d.jpg');

  res.writeHead(200, {'Content-Type': 'text/xml'});
  res.end(twiml.toString());
});

http.createServer(app).listen(1337, () => {
  console.log('Express server listening on port 1337');
});