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Vali-Validation

Lightweight fluent validation library for .NET 7, 8, and 9 — zero external dependencies.

Architecture Overview​

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Package Ecosystem​

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PackagePurpose
Vali-ValidationCore library: validators, rules, ValidationResult, ValidationException
Vali-Validation.AspNetCoreMiddleware, endpoint filters, action filters
Vali-Validation.MediatRIPipelineBehavior for MediatR (throws ValidationException)
Vali-Validation.ValiMediatorIPipelineBehavior for Vali-Mediator (returns Result<T>.Fail)

Validation Flow​

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Quick Example​

public class CreateProductValidator : AbstractValidator<CreateProductRequest>
{
    public CreateProductValidator()
    {
        RuleFor(x => x.Name)
            .NotEmpty().WithMessage("Name is required.")
            .MinimumLength(3);

        RuleFor(x => x.Price)
            .GreaterThan(0m).WithMessage("Price must be positive.");
    }
}

// DI registration
builder.Services.AddValidationsFromAssembly(typeof(Program).Assembly);

// Usage
var result = await validator.ValidateAsync(request);
if (!result.IsValid)
    return Results.ValidationProblem(result.Errors.ToDictionary(k => k.Key, v => v.Value.ToArray()));

Get Started​