express.js

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

const express = require('express')
const app = express()
const port = 3000

app.use(bodyParser.json({
    verify: (req, res, buf) => {
        req.rawBody = buf
    }
}))

app.get('/', (req, res) => {
    res.send('Hello World!')
})

app.post('/message', twilio.webhook(), (req, res) => {
    // Twilio Messaging URL - receives incoming messages from Twilio
    const response = new MessagingResponse();

    response.message(`Your text to me was ${req.body.Body}.
                    Webhooks are neat :)`);

    res.set('Content-Type', 'text/xml');
    res.send(response.toString());
});

app.listen(port, () => {
    console.log(`Example app listening at http://localhost:${port}`)
})