Express.js

 Express.js: Express.js is a popular web framework for Node.js that provides a simple and flexible way to build web applications. It provides a wide range of features, including routing, middleware, and templating engines. Here's an example of how to create a basic Express.js server:

javascript

const express = require('express');

const app = express();

app.get('/', (req, res) => {

  res.send('Hello, world!');

});

app.listen(3000, () => {

  console.log('Server listening on port 3000');

});