Express.js - hello world

Install:

npm init

npm install express --save

// npm notice created a lockfile as package-lock.json. You should commit this file.
// + express@4.17.1
// added 50 packages from 37 contributors and audited 126 packages in 2.502s
// found 0 vulnerabilities

Express:

Create de file app.js.

Run:

node app.js
// Example app listening on port 3000!