Node.js Crash Course - Part 3 - Clients & Servers

Creating a server in node

const http = require('http');

const server = http.createServer((req, res)=>{
    console.log('Everytime a request is made, I pops up.');
})

The callback function in the above code block runs every time a request is made.
The arguments of the callback function are req and res. In req, the information about incoming request is present and through req the response is sent back.

This alone is not doing anything. The server have to actively listen to the requests.
server.listen()

server.listen(3000, 'localhost', ()=>{
    console.log('Listening to port number 3000')
});