how to create rest api using nodejs

step: 1

         install node js this url https://nodejs.org/en/

step: 2

         open command prompt check node version  : node --version

step: 3

         now create sample project with specific folder node js type : npm init -y

step: 4

        than install express js type: npm install express --save

step: 5

       create index.js file add snippets code :
     
       const express = require("express");
       const app = express();

       app.get("/itselfdata", function (req, res) {
              res.send({
                    name: "ajay vishwakarma",
                    profession:"software developer"
              })
       });

       app.listen(44859, '192.168.0.106' || 'localhost',function () {
              console.log("server is running on port 44859");
       });

       run on postman : http://192.168.0.106:44859/itselfdata

step: 6

        run index.js file : node index.js

step: 7

       -  you must install nodemon type : npm install -g  nodemon
       -  than you can run nodemon index.js

Note : nodemon is utility that will monitor for any changes in your  source code and automatically
           restart your server.