when execute code Error occur :Error: (node:1200) DeprecationWarning: current URL string parser is deprecated, and will be removed in a future version. To use the new parser, pass option { useNewUrlParser: true } to MongoClient.connect. Error: Userna

[Susheel Kumar]

const path = require('path');

const express = require('express');

const bodyParser = require('body-parser');

const mongoose = require('mongoose');

const session = require('express-session');

const MongoDBStore = require('connect-mongodb-session')(session);

const errorController = require('./controllers/error');

const User = require('./models/user');

const app = express();

const  MONGODB_URI = 

  'mongodb+srv://susheelkumar:yao@9944@node-projects-xdyvq.mongodb.net/shop'

mongoose.connect(MONGODB_URI, { useNewUrlParser: true, useUnifiedTopology: true})

const store = new MongoDBStore({

  uri: MONGODB_URI,

  collection: 'sessions'

});

app.set('view engine', 'ejs');

app.set('views', 'views');

const adminRoutes = require('./routes/admin');

const shopRoutes = require('./routes/shop');

const authRoutes = require('./routes/auth');

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

app.use(express.static(path.join(__dirname, 'public')));

app.use(

  session({

    secret: 'my secret',

    resave: false,

    saveUninitialized: false,

    store: store

  })

);

app.use((req, res, next) => {

  if (!req.session.user) {

    return next();

  }

  User.findById(req.session.user._id)

    .then(user => {

      req.user = user;

      next();

    })

    .catch(err => console.log(err));

});

app.use('/admin', adminRoutes);

app.use(shopRoutes);

app.use(authRoutes);

app.use(errorController.get404);

mongoose

  .connect(MONGODB_URI)

  .then(result => {

    User.findOne().then(user => {

      if (!user) {

        const user = new User({

          name: 'susheel',

          email: 'sushe...@gmail.com',

          cart: {

            items: []

          }

        });

        user.save();

      }

    });

    app.listen(3000);

  })

  .catch(err => {

    console.log(err);

  });