dotnet-fluent-validation

Automate .NET 8 input validation with FluentValidation and DI registration.

1|Updated Feb 10, 2026

Search Tags:#validation #dotnet #dto #aspnetcore #di #fluentvalidation

Ready to run

npx skills add https://github.com/landim32/awesome-ai-skills --skill dotnet-fluent-validation-landim32

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: dotnet-fluent-validation
Source: https://github.com/landim32/awesome-ai-skills/tree/main/skills/dotnet-fluent-validation
Command: npx skills add https://github.com/landim32/awesome-ai-skills --skill dotnet-fluent-validation-landim32

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

FluentValidation-based validation standardizes and centralizes input validation across .NET 8 apps, reducing boilerplate and preventing invalid data from entering the domain.

Core Features & Use Cases

Create validator classes deriving from FluentValidation.AbstractValidator<T> and implement rules for DTOs.
Register validators in DI (e.g., AddValidatorsFromAssemblyContaining(...)) and optionally use a ValidationFilter to auto-validate requests.
Apply in controllers and services to enforce consistent, testable validation across layers, including nested objects and collections.

Quick Start

Create a validator for your DTO, wire it into DI, and start validating inputs in services.

Frequently Asked Questions about dotnet-fluent-validation

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I validate DTOs in ASP.NET Core using FluentValidation?▼

To validate DTOs in ASP.NET Core using FluentValidation, create validator classes deriving from AbstractValidator<T>, register them in DI using AddValidatorsFromAssemblyContaining, and apply rules to controllers or services to enforce consistent input validation.

What is the best way to centralize input validation in .NET 8 projects?▼

Centralizing input validation in .NET 8 is achieved by using FluentValidation to define rules in AbstractValidator<T> classes and registering them via dependency injection, which standardizes enforcement across API controllers, services, and domain layers.

Can I automatically validate nested objects and collections in .NET?▼

Yes, you can validate nested objects and collections in .NET by deriving validators from AbstractValidator<T> and defining rules for nested properties, ensuring invalid data is prevented from entering the domain across all layers.

Do I need to manually call ValidateAndThrow in my services or can I use a filter?▼

You can either explicitly call ValidateAndThrow in your services or optionally add a ValidationFilter to auto-validate requests, depending on whether you want manual control or automatic enforcement during the ASP.NET Core pipeline.

Why does FluentValidation require dependency injection setup in .NET 8?▼

FluentValidation requires dependency injection setup in .NET 8 to automatically discover and register validator classes from assemblies using DependencyInjectionExtensions, reducing boilerplate and ensuring validators are available across API controllers and services.