error-handling

To return consistent API errors in .NET, use the Result pattern for expected business failures and map them to RFC 9457 ProblemDetails. This avoids throwing exceptions for normal control flow and ensures clients receive predictable, structured error responses.

The best way to implement global exception handling in a .NET API is to use middleware that catches unexpected exceptions, logs structured errors, and returns safe ProblemDetails responses in production without leaking internal exception details.

FluentValidation integrates with .NET endpoint filters to validate requests at the API boundary. When validation fails, the filter intercepts the request and returns a typed validation ProblemDetails response, ensuring consistent API error contracts.

Yes, you can map typed errors to specific HTTP status codes in a .NET 10 API by defining error records or enums. This typed error mapping provides richer client behavior and ensures failures surface as predictable, localized ProblemDetails payloads.

The RFC 9457 ProblemDetails standard works seamlessly with .NET API error contracts by structuring failure responses with type, title, status, detail, and optional errors fields. This ensures consistent, well-formed API responses across expected and unexpected failures.

You should not use exceptions for expected API error handling in .NET when dealing with normal business conditions like validation failures or not found results. Instead, use the Result pattern to surface predictable RFC 9457 ProblemDetails without incurring exception overhead.