messenger_webhook.js

// Post endpoint to receive requests from Facebook
app.post('/webhook/', (req, res) => {
  messaging_events = req.body.entry[0].messaging
  for (i = 0; i < messaging_events.length; i++) {
    event = req.body.entry[0].messaging[i];
    // Check to see if the event was a message from 
    if (event.message && event.message.text) {
      text = event.message.text
      console.log(‘Heres\’s what the user said ’, text);
      continue
    }
    // Check to see if the event was a postback for a Facebook event - https://developers.facebook.com/docs/messenger-platform/reference/webhook-events/messaging_postbacks/
	console.log(‘Hey this was a postback!’)
      continue
    }
  }
  res.sendStatus(204);
});