facebook

facebook.app.js

// Accepts POST requests at the /webhook endpoint
app.post('/webhook', (req, res) => {
  let body = req.body;
  if (body.object === 'page') {
    body.entry.forEach(function(entry) {
        let event = entry.messaging[0];
        if (event.message && event.message.text) {
            // handle the message
            handleMessage(event);
        }
    });
    // Return a '200 OK' response
    res.status(200).send('EVENT_RECEIVED');
  } else {
    // Return a '404 Not Found'
    res.sendStatus(404);
  }
});