global-validation

Implement comprehensive validation on server and client sides with fail-fast checks, specific error messages, input sanitization, and consistent validation across all entry points. Use this skill when validating user input or form data, implementing server-side validation logic, adding client-side validation for user experience, creating validation schemas or rules, implementing type and format checks, sanitizing input to prevent injection attacks, validating business rules, creating field-specific error messages, implementing allowlist validation patterns, or ensuring consistent validation across web forms, API endpoints, and background jobs. Use when working with validation libraries, form handlers, API request validators, or any code that processes user input.