When it comes to controlling which users can access which functionality in a Blazor application you not only have access to all of the user’s authentication you can authorize the user’s actions without writing any code.

Authentication and authorization are two fundamental functions in most applications today. Until recently, it wasn't very clear how to best achieve these functions in Blazor applications.

The latest preview for .NET Core 3 (preview-6) has introduced the functionality to add authentication and authorization in a server-side Blazor application. In this article, you can learn how to implement authentication and authorization using Facebook in a server-side Blazor application.