global-validation

Implement input validation using class-validator decorators, custom validators, and business rule validation patterns. Use this skill when adding validation decorators to DTOs, creating validator service classes (*.validator.ts), implementing existence/uniqueness checks, or validating business rules in use cases. This includes using decorators like @IsNotEmptyString, @MaxLength, @IsArray, @IsString, creating custom decorators, and implementing fail-fast validation patterns in validator classes. Apply when working with DTO files, validator classes in shared/validator/, or implementing input sanitization.

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