Rest API example by Express JS

Application File

var express = require('express');
var bodyParser = require('body-parser');

var routerObject = require('router file path'); //routes are defined here

var app = express(); //Create the Express app

app.listen(8000);

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: true}));

app.use('/api', routerObject); //This is our route middleware

module.exports = app;

router file 

var express = require('express');
var router = express.Router();

router.get('/sample', function (request, response) {
    response.json({response:'hello world'});
});


module.exports = router;

Call API As

http://localhost:8000/api/routerObject/sample