Express session won't persist, even with MongoStore using connect-mongo

Question

When I restart my server, my session ends and I am logged out. This does not happen on a regular page refresh. I am using connect-mongo to remedy this:

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

Here is the code I am using to store my session, reusing an existing Mongo connection called thisDb:

app.use(session({                                
        secret: secretHash,
        saveUninitialized: true,
        resave: true,
        secure: false,
        store: new MongoStore({ db: thisDb })
}));

During a successful log in:

var day = 60000*60*24;
req.session.expires = new Date(Date.now() + (30*day));          
req.session.cookie.maxAge = (30*day);  

In my Mongo shell, I can verify that a new session is created when I log in:

db.sessions.find()

{"cookie":{"originalMaxAge":2592000000,"expires":"2017-11-17T20:36:12.777Z","httpOnly":true,"path":"/"},"user":{"newNotifications":false,"username":"max","admin":"true","moderator":"true"},"expires":"2017-11-17T20:36:10.556Z"}

Answer 1

Well, almost 3 years later i was having this issue. Don't know if OP was using Passport but i resolved this issue by moving this functions from inside the passport.use function to outside:

passport.serializeUser(function(user, done){
    done(null,user.id);
});

passport.deserializeUser((id,done) => {
    User.findById(id, (err,user) => {
        done(null,user);
    });
});