Express.js is a popular, flexible and minimalistic framework for building web applications and APIs using Node.js. It provides a simple and easy-to-use interface for creating HTTP servers, routing requests, and handling middleware.

Express.js is a powerful and easy-to-use framework that makes it simple to build web applications and APIs with Node.js. It's routing, middleware, and template engine support make it a great choice for building a wide variety of applications.

Express.js features:

One of the key features of Express.js is its routing system. With Express, you can define routes for different HTTP methods (GET, POST, PUT, DELETE, etc.) and URLs. This allows you to handle different types of requests and respond with the appropriate data or actions.

Express also supports middleware, which are functions that can be executed before or after a request is handled. These middlewares can be used for a variety of tasks, such as parsing request bodies, handling authentication and authorization, and serving static files.

Another great feature of Express is its support for template engines. This allows you to easily render dynamic HTML pages by passing data to a template, rather than manually constructing the HTML in your code.

How to get started with Express.js:

To get started with Express, you will need to have Node.js installed on your computer. Once you have Node, you can install Express using npm (Node Package Manager) by running the command "npm install express".

In the following code snippet, we create a simple server using Express.js

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

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

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

In this example, we require the Express module, to create an Express application, and define a route for the root URL("/") that will respond "Hello World!" when a GET request is made. We then tell the app to listen on port 3000 for incoming requests.

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