Create a test webhook endpoint | Developer Documentation

// Import Express.jsconst express =require('express');// Create an Express appconst app = express();// Middleware to parse JSON bodies
app.use(express.json());// Set port and verify_tokenconst port = process.env.PORT ||3000;const verifyToken = process.env.VERIFY_TOKEN;// Route for GET requests
app.get('/',(req, res)=>{const{'hub.mode': mode,'hub.challenge': challenge,'hub.verify_token': token }= req.query;if(mode ==='subscribe'&& token === verifyToken){
    console.log('WEBHOOK VERIFIED');
    res.status(200).send(challenge);}else{
    res.status(403).end();}});// Route for POST requests
app.post('/',(req, res)=>{const timestamp =newDate().toISOString().replace('T',' ').slice(0,19);
  console.log(`\n\nWebhook received ${timestamp}\n`);
  console.log(JSON.stringify(req.body,null,2));
  res.status(200).end();});// Start the server
app.listen(port,()=>{
  console.log(`\nListening on port ${port}\n`);});