req.session.user未定义通过AngularJS

I'm building a website in MEAN, and for authentication and remembering user data, I use the req.session in the Node backend. So I start storing the data when the user is logging in, and re-using it for certain calls. The problem is that when I do the call from my front-end in Angular, the req.session.user data is undefined. Even though It is correctly initialised.I'm building a website in MEAN, and for authent