My Node/Express session expires with every change to my code

Question

I am working on a local Node/Express app and am using express-session.

To test my code, I need to log into a user account. Every time I make a change in my code - even if I just add a space - the session ends and I get logged out. With no changes, my session persists as intended. Why?

Here's how my session is set:

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

I am using Nodemon, so my server restarts on every save. Is this why?

EDIT: looks like the issue is with restarting the server, not with the code change. Relevant answers here:

(1) Express 4 Sessions not persisting when restarting server

(2) Node.js server restart drops the sessions

Answer 1

Looks like the issue is with restarting the server, not with the code change. By default, sessions are stored in MemoryStore. Relevant answers here:

(1) Express 4 Sessions not persisting when restarting server

(2) Node.js server restart drops the sessions