Initial Express Code

express_start.js

// section 1
const express = require('express');
const app = express();

// section 2
app.get('/', (req, res) => { 
 res.send("<h1>Welcome to the world of Express!</h1>");
});

// section 3
app.listen(3000, (req, res) => { 
 console.log('server started on port 3000');
});