如何使用ASP.NET Web API在Javascript后端使用JWT client_id

I'm trying to implement JWT authorization in a project. However in order to successfully get the token I have to pass client_id from AngularJS frontend to ASP.NET Web API backend and as far as I know it is not secure at all. So could someone please give me a hint about what should I be doing in my situation.I'm trying to implement JWT authorization in a