Every error your ASP.NET Core API returns is a documented, structured Problem Details payload. Except one. When a bearer token is missing, expired, or malformed, the client gets a 401 with an empty bo
JWT authentication is one of those topics where the basics feel approachable but the production edge cases bite hard. Most ASP.NET Core APIs get the happy path working in an afternoon — and then spend
Broken authentication is the second entry on the OWASP API Security Top 10 for good reason - it is one of the most consistently exploited vulnerabilities in production APIs, and ASP.NET Core teams are
Cookie authentication and JWT bearer tokens are both first-class citizens in ASP.NET Core's authentication middleware, and both can secure an API. The problem is that teams regularly pick one without
JWT bearer authentication is one of the most widely used security patterns in ASP.NET Core APIs — and "JWT bearer token returns 401 Unauthorized" is one of the most Googled errors in the .NET ecosyste
Authentication and authorization are among the most scrutinized areas in any senior .NET interview. Interviewers don't just want to know that you've plugged in AddAuthentication() and moved on - they
