Express.js : Mongo as session store

    Inside app.js from express.js

    just after

        var express = require('express');
    add
        var session = require('express-session');
        const mongoose = require('mongoose');
        const MongoStore = require('connect-mongo')(session);

        mongoose.connect('mongodb://localhost/sessionstore', {
           
        });

        mongoose.Promise = global.Promise;
        const db = mongoose.connection
    then at first app.use add
        app.use(session({
          secret: 'my-secret',
          resave: false,
          saveUninitialized: true,
          store: new MongoStore({ mongooseConnection: db })
        }));

    inside some route try to save session

        req.session.city = 'Mumbai';
      req.session.username = 'sangram';

    inside another route try to retreive saved value

              console.log(req.session.city)
       console.log(req.session.username)

    to check data is saved in mongo ,connect to mongo and switch database and check

    > show collections
    sessions

    > db.sessions.find().pretty()
    {
        "_id" : "yAuqRI1gIxFOHUbxpxjGasiK61ZvrWT-",
        "session" : "{\"cookie\":{\"originalMaxAge\":null,\"expires\":null,\"httpOnly\":true,\"path\":\"/\"},\"city\":\"Mumbai\",\"username\":\"sagar\"}",
        "expires" : ISODate("2018-10-14T05:32:38.869Z")
    }

Code of article can be viewed at https://github.com/gitsangramdesai/mongo-sessionstore-express