dotnet-input-validation

You can validate inputs in an ASP.NET Core Minimal API by applying endpoint filters to intercept requests and enforce validation rules. This prevents invalid JSON payloads from reaching your core logic and automatically returns ProblemDetails error responses for failures.

The best way to handle complex business rules during .NET API input validation is using FluentValidation. It allows you to define intricate validation logic cleanly separated from your data models, ensuring security and robustness for incoming API requests.

Yes, this approach supports .NET 10 built-in validation alongside FluentValidation and Data Annotations. You can use these multiple validation strategies to handle both simple models and complex rules within your application.

You return standard error responses when API input validation fails by utilizing ProblemDetails. Generating a ValidationProblem response communicates failed rules back to the client using the standard ASP.NET Core ProblemDetails format.

To prevent ReDoS attacks when validating inputs in a .NET application, apply security best practices for input handling. This includes using ReDoS prevention techniques, allowlisting, and secure file upload validations to protect API stability.