Vali-Validation.AspNetCore 1.0.3

Vali-Validation.AspNetCore

ASP.NET Core integration for Vali-Validation. Provides middleware, endpoint filters, and action filter attributes for automatic HTTP request validation.

Installation

dotnet add package Vali-Validation.AspNetCore

Features

• ValiValidationMiddleware — catches ValidationException and returns an RFC 7807 problem+json HTTP 400 response.
• ValiValidationFilter<T> — Minimal API IEndpointFilter that validates a request DTO before the endpoint executes.
• ValiValidateAttribute — MVC IAsyncActionFilter attribute for automatic controller action validation.

ValiValidationMiddleware

Catches any ValidationException thrown anywhere in the pipeline and returns a structured 400 response.

// Program.cs
app.UseValiValidationExceptionHandler(); // place before routing/controllers

Optional DI helper for ProblemDetails:

builder.Services.AddValiValidationProblemDetails();

ValiValidationFilter<T> — Minimal API

Validates a bound argument of type T before the endpoint executes. If no IValidator<T> is registered, the filter is a no-op.

// Using the fluent extension (recommended)
app.MapPost("/users", (CreateUserDto dto) => Results.Ok())
   .WithValiValidation<CreateUserDto>();

// Or explicitly
app.MapPost("/users", (CreateUserDto dto) => Results.Ok())
   .AddEndpointFilter<ValiValidationFilter<CreateUserDto>>();

Validators must be registered in DI:

builder.Services.AddScoped<IValidator<CreateUserDto>, CreateUserDtoValidator>();
// or using the bulk-registration helper from Vali-Validation:
builder.Services.AddValidationsFromAssembly(typeof(CreateUserDtoValidator).Assembly);

ValiValidateAttribute — MVC Controllers

Apply to a controller or a single action to validate all incoming arguments automatically.

[ApiController]
[ValiValidate]
public class UsersController : ControllerBase
{
    [HttpPost]
    public IActionResult Create(CreateUserDto dto) => Ok();
}

Or per action:

[HttpPost]
[ValiValidate]
public IActionResult Create(CreateUserDto dto) => Ok();

Validation Error Response Format (RFC 7807)

When validation fails, the response is HTTP 400 with Content-Type: application/problem+json:

{
  "type": "https://tools.ietf.org/html/rfc7807",
  "title": "One or more validation errors occurred.",
  "status": 400,
  "errors": {
    "Name": ["'Name' must not be empty."],
    "Email": ["'Email' is not a valid email address."],
    "Age": ["'Age' must be greater than 0."]
  }
}

Donations

If Vali-Validation is useful to you, consider supporting its development:

• Latin America — MercadoPago
• International — PayPal

License

Apache License 2.0

Contributions

Issues and pull requests are welcome on GitHub.