stop.js

// Sign up for nexmo.com
// Purchase a number
// Set the webhook URL for inbound messages (https://dashboard.nexmo.com/settings) to be yourdomain.com:3000/webhooks/sms-inbound
// Fill in the Twitter credentials below (you'll need to register an application at https://apps.twitter.com)
// Run this code
// Send STOP to the number you created
// Watch as @rosstuck gets a tweet asking him to stop

const app = require('express')()
const bodyParser = require('body-parser')

const Twitter = require('twitter');

var client = new Twitter({
  consumer_key: '',
  consumer_secret: '',
  access_token_key: '',
  access_token_secret: ''
});

app.use(bodyParser.json())
app.use(bodyParser.urlencoded({ extended: true }))

app
  .route('/webhooks/inbound-sms')
  .get(handleInboundSms)
  .post(handleInboundSms)

function handleInboundSms(request, response) {
  const params = Object.assign(request.query, request.body)
  console.log(params)
  if (params.text == 'STOP') {
    client.post('statuses/update', {status: '@rosstuck STOP! Please... stop...'},  function(error, tweet) {
      if(error) throw error;
      console.log(tweet);
    });
  }
  response.status(204).send()
}

app.listen(3000)