The goal of serializing / deserializing users into a session when using PassportJS?

Question

What is the purpose of serializing / deserializing users in a session when using PassportJS? I have worked with JSP before and there seems to be no such thing.

Answer 1

It controls how the user instance is stored in the session store (e.g. connect-redis ).

I am not an expert in JSP, but I assume that there is some kind of ISerializable interface that classes should implement, which would be a rough equivalent.