Introduction to Express.js in Node.js for Backend Development

Introduction to Express.js in Node.js is an important step in backend development. Express.js is a fast and lightweight framework that helps developers create servers and APIs easily. It reduces complexity and allows you to build backend applications using simple and clean code.

What is Express.js in Node.js

Express.js in Node.js is a web framework built on top of Node.js. It provides features like routing, middleware, and request handling. Express.js makes backend development faster compared to the HTTP module.

Why Use Express.js in Node.js

Easy Server Creation

Express.js allows you to create servers with very little code.

Simple Routing

You can handle URLs and requests easily using built-in methods.

Middleware Support

Middleware helps process requests before sending responses.

How to Install Express.js

Step 1 Initialize Project

npm init -y

Step 2 Install Express.js

npm install express

Create First Server Using Express.js

Basic Server Example

const express = require(‘express’);
const app = express();

app.get(‘/’, (req, res) => {
res.send(‘Hello from Express.js’);
});

app.listen(3000, () => {
console.log(‘Server running on port 3000’);
});

Routing in Express.js

GET Request Example

app.get(‘/about’, (req, res) => {
res.send(‘About Page’);
});

POST Request Example

app.post(‘/data’, (req, res) => {
res.send(‘Data Received’);
});

Middleware Example in Express.js

app.use((req, res, next) => {
console.log(‘Request received’);
next();
});

Why Express.js is Important

Express.js in Node.js is used to build APIs and backend applications quickly. It is widely used in real-world projects because of its simplicity and flexibility.

Continue Learning Backend Development

Now that you understand the introduction to Express.js in Node.js, you are ready to move to the next lesson where you will learn how to build a complete server using Express.js. To explore more structured tutorials and courses, click here for more free courses.