NodeJS. How to work with sessions?

Question

Node.js

Tell me how to save the session in NodeJs. Below is the content of the server.js file:

const express  = require('express');
const app      = express();
const session = require('express-session');
const MongoStore = require('connect-mongo')(session);
const mongoose = require('mongoose');
const port     = process.env.PORT || 8000;
const passport = require('passport');
const flash    = require('connect-flash');

const configDB = require('./config/database.js');

mongoose.connect(configDB.url, { useNewUrlParser: true }); 

require('./config/passport')(passport); 

app.configure(function() {
  app.use('/views',express.static('views'));
  app.use(express.logger('dev')); 
  app.use(express.cookieParser()); 
  app.use(express.bodyParser()); 

  app.set('view engine', 'ejs'); 

  app.use(express.session({
    key: 'FUSTSESSION',
    secret:'secret_mega_very_word',
    resave: true,
    saveUninitialized: true,
    cookie: { maxAge: 24 * 60 * 60 * 7 },					
     store: new MongoStore({
      mongooseConnection:mongoose.connection,
      ttl :  7 * 24 * 60 * 60
      clear_interval:3600										}
    )
}));
  app.use(passport.initialize());
  app.use(passport.session()); 
  app.use(flash()); 
});

require('./app/routes.js')(app, passport); 

app.listen(port);
console.log('The magic happens on port ' + port);

I would appreciate any corrections!