Express.js is a web application framework for Node.js, designed for building web applications and APIs. It is the de facto standard server framework for Node.js. It provides a robust set of features for web and mobile applications, and is the most popular framework for building Node applications.
Example:
var express = require(‘express’);
var app = express();
app.get(‘/’, function (req, res) {
res.send(‘Hello World!’);
});
app.listen(3000, function () {
console.log(‘Example app listening on port 3000!’);
});