Making a server with NodeJS and Express

Importing Express packages

• In the server.js

import express from "express"

Creating Express application

• express function

const app = express();

• What is server(application)?

  Basically, server is a computer(without monitor or keyboard) which is turned on 24/7 and connected to internet to listen requests.

• What is request?

  Request is a message from a user(or a browser) send to server for interaction.(login, searching, and etc)
  Any interaction a user having with a browser.

• What is callback?

  Callback is a function which server returns for the request

Setting a localhost with port number

import express from "express"

const app = express();

const callbakcFunction = () => console.log("Server is listening on localhost port 4000");

app.listen(portNumber, callbackFunctionName);

• This open up and make and run the server to listen