Introduction to Express.js

🚀 What is Express.js?

Express.js is a fast, minimal, and flexible Node.js web application framework designed for building web applications and APIs. It simplifies server-side development by providing robust features for handling requests, routes, middleware, and more.

🛠️ Why Use Express.js?

• Minimal & Fast: Lightweight framework with powerful features.
• Routing System: Simplifies defining application routes.
• Middleware Support: Easily handle requests, authentication, and errors.
• Template Engines: Supports Pug, EJS, and Handlebars for dynamic HTML.
• RESTful APIs: Ideal for creating RESTful web services.

📥 Installing Express.js

To install Express.js, use the following command:

npm install express

🔥 Basic Express.js Application

Here’s how to create a simple Express server:

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

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

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

Run the script and visit http://localhost:3000/ in your browser.

🌟 Key Features of Express.js

• Fast & Efficient 🚀
• Middleware Support 🛠️
• Robust Routing System 🛤️
• Error Handling ⚠️
• Support for RESTful APIs 🔄

🔑 Keywords Related to Express.js

Express.js, Node.js framework, REST API, middleware, routing, request handling, asynchronous, MVC pattern, server-side JavaScript, real-time applications, templating engines, API development, HTTP methods, scalable web apps.