Node.js with create server using Express with middleware function

Express using create server.

const express = require('express');

const app = express();

// Middleware to parse JSON body data

app.use(express.json());

// Custom Middleware to Modify Request Data

app.use((req, res, next) => {

  if (req.body && typeof req.body === 'object') {

    // Add a new property to the request body

    req.body.modified = true;

    // Log the modified request body

    console.log('Modified Request Data:', req.body);

  }

  next(); // Pass control to the next middleware/route handler

});

// Example Route to Test Middleware

app.post('/data', (req, res) => {

  res.send({

    message: 'Request received successfully!',

    requestData: req.body,

  });

});

// Start the Server

const PORT = 3000;

app.listen(PORT, () => {

  console.log(`Server is running on http://localhost:${PORT}`);

});