validation-patterns

SKILL.md

Validation Patterns in ASP.NET Core

Rationale

Validation is critical for both security and user experience. Poor validation leads to invalid data, security vulnerabilities, and confusing error messages. These patterns provide a comprehensive approach to validation at multiple layers.

Validation Strategy

Layer
Purpose
Technology

Client-Side
Immediate feedback, reduce server load
jQuery Validation, HTML5

Model Binding
Data type/format validation
Model Binders

Application
Business rule validation
FluentValidation, DataAnnotations

Configuration
Startup validation
IValidateOptions

Database
Constraint enforcement
EF Core Configurations

Validation Approach Decision Tree

Choose the validation approach based on complexity: