What you'll learn

APIs often fail in inconsistent, confusing, or insecure ways when validation and error handling are treated as afterthoughts. This course solves the problem of unpredictable API behavior by showing how validation, filters, and exception handling actually execute in ASP.NET Core 10.

In this course, Implementing Validation, Filters, and Error Handling in ASP.NET Core 10 Web APIs, you’ll move beyond ad-hoc validation and error handling and develop a clear mental model of how ASP.NET Core 10 Web APIs process requests end to end.

First, you’ll understand why validation, filters, and exception handling matter—not just for correctness, but for security, observability, and operating APIs in production.

Next, you’ll see where these mechanisms execute in both controller-based APIs and minimal APIs, and how their placement affects reliability and information disclosure.

Finally, through hands-on implementation, you’ll centralize cross-cutting concerns using endpoint filters, action filters, and exception filters, reducing duplication and preventing policy drift.

When you're finished with this course, you'll have the skills needed to design predictable, consumer-friendly error responses with ProblemDetails and centralized exception handling, and learn how to reason about failure paths as a deliberate API strategy rather than an afterthought.