What are Express.js controllers and how do I use them?

What are Express.js controllers and how do I use them?

Express.js controllers are JavaScript functions that handle incoming requests and send responses. They help organize your code by separating the logic for handling requests from the routing logic.

Can you give me an example of a simple controller?

Sure! Here's a basic example:

// userController.js
const getUser = (req, res) => {
    res.send('User data');
};

module.exports = { getUser };

You can then use this controller in your routes.

How do I connect this controller to a route?

You can connect it like this:

const express = require('express');
const userController = require('./userController');
const router = express.Router();

router.get('/user', userController.getUser);

module.exports = router;

This sets up a route that calls the getUser function when a GET request is made to /user.

What are the benefits of using controllers?

Using controllers helps keep your code organized, makes it easier to maintain, and allows for better separation of concerns in your application.