What are Controllers?

• Controllers are functions that handle the logic for processing incoming HTTP requests and sending appropriate responses.
• They separate business logic from route definitions, keeping your code organized and clean.
• Typically, each controller corresponds to a resource or feature (like userController, productController, etc.)

Example Controller

// controllers/userController.js

exports.getAllUsers = (req, res) => {
  res.send("List of all users");
};

exports.createUser = (req, res) => {
  const newUser = req.body;
  res.send(`User created: ${newUser.name}`);
};

• exports makes these controller functions available to other files (like route files).

Why Use Controllers?

• Keeps routing clean and readable
• Promotes modularity and reusability
• Separates concerns (routes → controller → service → database)