dotnet-api-auth

JWT Bearer authentication secures ASP.NET Core APIs by validating issuer, audience, and cryptographic keys. This pattern protects endpoints by requiring valid tokens, handling claims, and enforcing role checks before granting access to protected resources.

Resource-based authorization controls access by evaluating specific data resources against user claims using custom handlers. Use this pattern when policy-based role checks are insufficient and you need per-resource access control to restrict endpoint actions.

Yes, API key authentication can be implemented via middleware to secure ASP.NET Core APIs. This approach intercepts requests, validates the provided API key, and authorizes access, offering an alternative to JWT for service-to-service or client integrations.

Configure CORS to support cross-origin API access and register policy-based authorization in Program.cs. Policies enforce access using roles and claims, applying endpoint guards to ensure only authorized users reach protected API routes.

The best way to handle claims for protected APIs is generating JWT tokens that encapsulate user roles and specific claim data. This allows ASP.NET Core authorization handlers to validate tokens and enforce custom policy conditions securely.