index.js

require("dotenv").config();
// Import the express module
const express = require('express');
const port = 5001;
// Create an express app
const app = express();
const cors = require('cors');
const db = require('./config/mongoose');

const session = require('express-session');
const passport = require('passport');
const passportLocal = require('./config/passport-local-strategy');
const MongoStore = require('connect-mongo');

const flash = require('connect-flash');
const flashmiddleware = require('./config/flashmiddleware');
app.use(express.urlencoded({extended:true}));
app.use(cors());

// use the ejs template
app.set("view engine", "ejs");
app.set("views", './views');

// mongo store is used to store the session cookie in DB
app.use(
  session({
    name: "PlacementCell",
    secret:process.env.SECRET_KEY, // secret key for encryption of cookies, change it everytime you deploy your application on a server
    saveUninitialized: false,
    resave: false,
    cookie:{
      maxAge: 1000*60*100
    },
    store: MongoStore.create(
      {
        mongoUrl:'mongodb+srv://amansingh60046:Aman1704@acoding1704.zomv0zw.mongodb.net/db',
        autoRemove: 'disabled',
        mongooseConnection:db,
        collectionName:"sessions"
      },
      function(error){
        console.log(error || "connect mongodb setup is ok");
      }
    )
  })
);

// for Authentication
app.use(passport.initialize());
app.use(passport.session());
app.use(passport.setAuthenticatedUser);

//require for flash message
app.use(flash());
app.use(flashmiddleware.setFlash);

// use for express router
app.use('/', require('./routes'));

// Start the server
app.listen(port, function (error) {
    if (error) {
      console.log(`Error in connecting with server: ${error}`);
    }
    console.log(`Successfully connecting with server ${port}`);
});