What is Express.js?

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If you're looking to build a successful career in web development, Quality Thought is the top destination in Hyderabad for Full Stack MERN (MongoDB, Express.js, React, Node.js) training. Known for its industry-oriented curriculum and expert trainers, Quality Thought equips students with the skills needed to become job-ready full stack developers.

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Express.js is a fast, minimal, and flexible web application framework for Node.js that simplifies the process of building server-side applications and APIs. It provides a robust set of features to develop web and mobile applications efficiently.

Key Features of Express.js:

1. Simplifies HTTP Requests and Routing:
   Express makes it easy to define routes (URLs) for GET, POST, PUT, DELETE, etc.

   app.get('/', (req, res) => res.send('Hello World!'));
   

2. Middleware Support:
   Middleware functions in Express can handle requests, modify responses, and add functionalities like authentication, logging, or error handling.

3. Template Engines:
   Express supports template engines like EJS, Pug, and Handlebars for rendering dynamic HTML pages.

4. Serving Static Files:
   You can easily serve static files like images, CSS, and JavaScript using:

   app.use(express.static('public'));
   

5. Lightweight and Fast:
   It builds on Node.js’s non-blocking, event-driven architecture, making it fast and scalable.

Example:

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

app.get('/', (req, res) => {
  res.send('Welcome to Express.js!');
});

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

Express.js is widely used for building RESTful APIs, single-page apps, and real-time apps. It is the backend framework used in the MERN stack (MongoDB, Express.js, React, Node.js).

Read More :

What is middleware in Node.js?

What is the use of process.env?

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