Express.js Introduction

Writing a full web server using pure Node.js takes a lot of complicated code. Express.js is a free package that simplifies the process drastically. It is the most popular framework for building APIs and websites in Node.js.

1/* this starts an express server */
2const express = require('express');
3const app = express();
4
5app.get('/', (req, res) => {
6  res.send('Hello from Express!');
7});
8
9app.listen(3000);