Set Up a Basic Webhook Receiver in Node.js Express

const express = require('express');
const bodyParser = require('body-parser'); // For parsing JSON or URL-encoded bodies

const app = express();
const PORT = process.env.PORT || 3000;

// Middleware to parse JSON bodies
app.use(bodyParser.json());

// Webhook endpoint
app.post('/webhook', (req, res) => {
  const event = req.body; // The payload sent by the webhook provider

  if (!event) {
    return res.status(400).send('Request body is empty');
  }

  console.log('Received webhook event:', event);

  // --- Your custom logic here ---
  // Example: Process the event based on its type
  if (event.type === 'order.created') {
    console.log(`New order created: ${event.data.orderId}`);
    // Call another service, update database, send notification, etc.
  } else if (event.type === 'user.updated') {
    console.log(`User updated: ${event.data.userId}`);
  }
  // -------------------------------

  // Respond to the webhook sender to acknowledge receipt
  // A 200 OK status code tells the sender the webhook was received successfully.
  res.status(200).send('Webhook received successfully!');
});

// Basic route for health check or root access
app.get('/', (req, res) => {
  res.send('Webhook listener is running!');
});

app.listen(PORT, () => {
  console.log(`Webhook server listening on port ${PORT}`);
  console.log(`Endpoint: http://localhost:${PORT}/webhook`);
});

// Note: For production, consider adding webhook signature verification
// to ensure the request truly comes from the expected source. This snippet
// focuses on basic reception and parsing only.