You created a mongodb database user, not a NodeBB user. Creating NodeBB users is more complicated.
I want to use NodeBB user sessions on another site
Looking for solutions for this problem I tried nodebb-plugin-session-sharing plugin, which is supposed to generate JWT token if I understand correctly, I didn't manage yet to generate it although I think I correctly configured it.
Anyways, what I see in the cookie storage is cookie named express.sid which itself seems that it's not JWT cookie, but of some other kind, what I would want to know is it possible to decode that cookie on different subdoman of the same site, what I have is forum.domain.com (where NodeBB is installed) and app.domain.com which is running Node.js application.
I need a simplest solution I can get, I don't want to mess with SSO systems like FusionAuth of Keycloak, I want to use NodeBB's user registration system.