write an example of route in express where edit request and response object using middleware function

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Accepted Answer

const express = require('express');
const app = express();
const PORT = 3000;

// Middleware: Modify request and response objects
function addUserMiddleware(req, res, next) {
  // Add user info to the request object
  req.user = {
    id: 42,
    name: 'Alice',
    role: 'admin'
  };

// Add a custom header to the response
  res.setHeader('X-Middleware', 'Passed');

console.log('Middleware ran and added user to req');
  next(); // pass control to next handler
}

// Route using the middleware
app.get('/profile', addUserMiddleware, (req, res) => {
  // Access user data from the middleware
  const user = req.user;

// Send custom response using modified objects
  res.status(200).json({
    message: `Welcome back, ${user.name}!`,
    user: user
  });
});

// Start the server
app.listen(PORT, () => {
  console.log(`Server running at http://localhost:${PORT}`);
});

write an example of route in express where edit request and response object using middleware function

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