Validate and sanitize all user input using schema validation libraries. Activate whenever the user writes form handlers, API endpoints, request parsers, data processing functions, or any code that accepts external input. Also activate when the user asks about validation libraries like Zod, Joi, or Pydantic, or discusses input sanitization.
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Input Validation Guide
Validate all external input at system boundaries using schema validation libraries. Reject invalid data early with clear error messages. Never trust client-side validation as the sole defense.
When to Use
Writing API endpoint handlers that accept request bodies, query params, or path params
Building form validation logic (server-side)
Processing data from external APIs or file uploads
Parsing configuration files or environment variables
Any function that r
[Description truncada. Veja o README completo no GitHub.]
