global-validation

Implement comprehensive input validation on both client and server sides with clear error messages, type checking, and sanitization to prevent security vulnerabilities. Use this skill when validating user input, implementing form validation, checking data types and formats, sanitizing input to prevent injection attacks (SQL, XSS, command injection), validating business rules, providing field-specific error messages, implementing server-side validation for all entry points (API endpoints, web forms, background jobs), using client-side validation for immediate user feedback, applying allowlists over blocklists, validating ranges and required fields, or ensuring consistent validation across the application. Apply this skill when handling any user input, building forms, creating API endpoints, or reviewing code for security and data integrity.

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