Basic Express.js v4 Hello, World Example

app.js

// This code is also express@5 compatible!

const express = require('express');
const app = express();
const port = 3000; // You can change the port by replacing '3000' with any number. But not like this: 'your port here'

app.get('/', (req, res) => res.send('Hello, World!'));

app.listen(port, () => console.log(`Server started on ${port}
To connect to your server, go to http://localhost:${port}
`));
/*
Prints:

Server started on 3000
To connect to your server, go to http://localhost:3000

*/