Express-session and cookie-parser - how to check the work?

Question

Node.js

I'm using a template where the version of express-session is 1.14.1. Cookie-parser is also used there. This is an app with Passport authentication.
The docs state:

Note Since version 1.5.0, the cookie-parser middleware no longer needs to be used for this module to work. This module now directly reads and writes cookies on req/res. Using cookie-parser may result in issues if the secret is not the same between this module and cookie-parser.

Those. I don't essentially need a cookie-parser? It is used in the code only once.
app.use(cookieParser());
If I delete this line, then the login and authorization are still successful.
I can't understand how this plugin works, do I need it now? If not needed - what to change in the code?

Answer 1

No, it's not needed, express-session has a cookie in dependencies.
Pretty easy to check, req -> res is a midelware event chain.
Create your custom before app.use(cookieParser()), see what is in the cookie field, and after. You also need to look at serialization, in which storage the sessions are located and how the passport will be checked.