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.net core/angular saving back-end data against a user



I have a angular single page application with a .net core api back-end. I am using the lock login page on the front-end. I send an auth_token to the back-end to authenticate the user against the back-end API.

How can I view properties of the user in the back-end such as user name or email?

What is the best way to relate back-end data to the logged in user? would it be to save the user-id against a back-end record?

string userId = User.Claims.FirstOrDefault(c => c.Type == ClaimTypes.NameIdentifier).Value;