Localhost keeps loading in nodejs - node.js

Question

I'm making a authentication system, here is my index.html file i'm using nodejs, express and for database mongodb.
Before it working fine but somehow now its give me no result on visual studio i find no error but the issue is it not giving me the result the keeps loading on the localhost page, i try to change the port but same issue.
const express = require('express');
const cookieParser = require('cookie-parser');
const app = express();
const port = 7000;
// for database
const db = require('./config/mongoose');
const user=require('./models/user');
// for passport authentication
const passport=require('passport');
const passportLocalStrategy=require('./config/passport-local');
const session = require('express-session');
const MongoStore = require('connect-mongo');
app.use(express.urlencoded());
app.use(cookieParser());
// for layouts
const layouts=require('express-ejs-layouts');
app.use(layouts);
// extract style and scripts from sub pages into the layout
app.set('layout extractStyles', true);
app.set('layout extractScripts', true);
//for static files
app.use(express.static('./assets'));
const path=require('path');
// set up the view engine
app.set('view engine', 'ejs');
app.set('views',path.join(__dirname,'views'));
//app.set('views', './views');
app.use(session({
name:'Authentication',
secret:'Dheeraj',
saveUninitialized:false,
resave:false,
cookie:{
maxAge:(1000*60*60)
},
store:( MongoStore.create({
mongoUrl: 'mongodb://localhost/NODEJS_AUTHENTICATION',
autoRemove : 'disabled'
},
function(err){
console.log(err || "connect-mongodb")
}))
}));
app.use(passport.initialize());
app.use(passport.session());
app.use(passport.setUserToLocals);
const passportOauth2Strategy = require('./config/passport-google-oauth2');
const flash=require('connect-flash');
app.use(flash());
app.use(function(req,res,next){
res.locals.flash ={
'success': req.flash('success'),
'error': req.flash('error')
}
next();
});
//use express router
app.use('/',require('./routes'));
app.listen(port, function(err){
if (err){
console.log(`Error in running the server: ${err}`);
}
console.log(`Server is running on port: ${port}`);
});