See demo : https://www.youtube.com/watch?v=7FOmlkQAEgU

Create a new directory, we can run the following command:

mkdir <directoryname>

then move inside the newly created directory:

cd <directoryname>

then  run this command : 

npm init

and fill this information like that :

package name: (directoryname)
version: (1.0.0)
description:
entry point: (index.js) server.js
test command:
git repository:
keywords:
author:
license: (ISC)
{

  "name": "curlapi",
  "version": "1.0.0",
  "description": "",
  "main": "server.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC"
}

Is this ok? (yes) yes then enter

After create project install node package run command:

npm install --save express mongoose morgan body-parser method-override

create server.js file and add this code :

var express = require('express');
var mongoose = require('mongoose');
var morgan = require('morgan');        
var mongoose = require('mongoose');
var bodyParser = require('body-parser'); 
var methodOverride = require('method-override');
var app = express();
//allow cross origin requests
app.use(function(req, res, next) {
    res.setHeader("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Methods", "POST, PUT, OPTIONS, DELETE, GET");
    res.header("Access-Control-Max-Age", "3600");
    res.header("Access-Control-Allow-Headers", "Content-Type, Access-Control-Allow-Headers, Authorization, X-Requested-With");
    next();
});
// configuration
app.use(express.static(__dirname + '/public'));                 // set the static files location /public/img will be /img for users
app.use(morgan('dev'));              
app.use(bodyParser.json({limit: '50mb'}));                          // log every request to the console
app.use(bodyParser.urlencoded({limit: '50mb','extended':'true'}));            // parse application/x-www-form-urlencoded                                // parse application/json
app.use(bodyParser.json({ type: 'application/vnd.api+json' })); // parse application/vnd.api+json as json
mongoose.connect('mongodb://localhost/curlapi');     // connect to mongoDB database
var Schema = mongoose.Schema;
// user schema
var userSchema = new Schema({
    user_name: String,
    password: String,
    first_name: String,
    last_name: String,
    user_email:String,
    status: String,
    date: { type: Date, default: Date.now }
});
var User = mongoose.model('User', userSchema);
module.exports = User;
app.get('/', function (req, res) {
  res.send('Hello World')
})
// post method pass user information in json object
app.post('/api/createUser', function(req, res) {
    User.create(req.body, function(err, user) {
            if (err){
               res.send(err);
            }
            if(user) {
               res.json(user);
            }
    });
});
// update method update user pass userid in object
app.put('/api/updateUser', function(req, res) {
    User.findByIdAndUpdate(req.body._id, req.body, {new: true}, function(err, user) {
        if (err){
            res.send(err);
        }
        res.json(user);
    });
});
// delete Methods pass user id in object
app.delete('/api/removeUser', function(req, res) {
    User.remove({_id : req.body._id }, function(err, user) {
        if (err)
            res.send(err);
        res.json(user);
    });
});
// GET METHODS
app.get('/api/getUsers', function(req, res) {
    User.find(req.body,function(err, users) {
        if (err)
            res.send(err)
        res.json(users);
    });
});
app.listen(process.env.PORT || 3000, function(){console.log("App listening on port 3000");});

Result : 

?

Github LInk : https://github.com/Sudarshan101/curlapinode