req.session added variables are not saved on mongo session store, nor on the browser

[mirker21]

• I'm submitting a ...
  [X] bug report
  [ ] feature request
  [ ] question about the decisions made in the repository
  [ ] question about how to use this project

Whenever I try to log in with the correct username and password on the Next.js front end (localhost:3000), in my post request for /login I am supposed to add two properties (.isAuth, and ._id) to my req.session on my Express.js back end (localhost:8080).

At first, these two things seem to be set, at least in /login. If the /login post request returns a 201 status code, the user is supposed to get redirected to the home page, and be able to see their data. However, when I get redirected to my home page, I cannot get any user data from the /user get request because req.session._id and req.session.isAuth don't exist anymore.

When I check my MongoDB session store, the cookies do get stored every time a user logs in and do disappear after expiration, but the info I wanted to store on the 'session' part was not there. When I try to look for any cookies on Chrome Developer Tools, I don't see any.

So far I haven't found a solution that has fixed my problem yet. I have looked at similar past issues on stackoverflow, on the open and closed issues on both express-session and connect-mongo, but nothing really helped so far. I am not sure if this is an express-session issue or a connect-mongo issue, so I posted this issue here, as well as in express-session's Issues section.

• **Here is the repository with all my current code surrounding this issue. **
• Setting secure to true, and sameSite to none does nothing.
• Including credentials in headers, cors middleware, and frontend requests did not do anything.
• When I look at the secure connection icon when viewing the website on localhost:3000, I get the "Your connection to this site is not secure" warning.
• Also after the post request, the Chrome Developer Tools sometimes gives an error "Attempted to use a disconnected port".
• I am on iOS, and am using Chrome to look at my website.
• I've tried Safari but it gives me the same problem.

If you would like to ask me about further details that I didn't mention that might contribute to this issue, or ask for clarification on anything I didn't explain that well, please don't hesitate!

Thank you all for your time and patience, it is much appreciated!