fluentvalidation-patterns

What problem does it solve?

This Skill provides patterns for implementing robust input validation using FluentValidation in .NET applications, solving the challenge of inconsistent and boilerplate validation logic. It enables you to define clear, expressive, and reusable validation rules, ensuring data integrity and improving API reliability.

Core Features & Use Cases

• Fluent API for Validation: Demonstrates how to define validation rules using FluentValidation's expressive API, making validators readable and maintainable.
• Custom Validation Rules: Guides on creating custom validation rules for complex business logic that cannot be covered by built-in validators.
• Asynchronous Validation: Patterns for performing asynchronous validation, such as checking for unique email addresses against a database.
• Integration with ASP.NET Core: Shows how to integrate FluentValidation seamlessly into ASP.NET Core MVC/API, automatically validating DTOs and returning consistent error responses.
• Use Case: A backend developer needs to validate user input for a CreateUserDto. Using this skill, they create a CreateUserDtoValidator with rules for email format, password complexity, and unique username, ensuring only valid data is processed.

Quick Start

Create a FluentValidation validator for a CreateProductDto that ensures the Name is not empty and the Price is greater than zero.