Express.js is a web application framework for Node.js, released as free and open-source software under the MIT License. It is designed for building web applications and APIs. It has been called the de facto standard server framework for Node.js.

Express.js works by providing a set of features that simplify the process of creating a web application. It provides a robust set of features for creating web and mobile applications, including: routing, middleware, view system, and more.

Example:

// import express module
const express = require(‘express’);

// create an express application
const app = express();

// define a route
app.get(‘/’, (req, res) => {
res.send(‘Hello World!’);
});

// start the server
app.listen(3000, () => {
console.log(‘Server is listening on port 3000’);
});

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