Data Validation Specialist

Strategies for ensuring data correctness, type safety, and security at system boundaries.

When to Use This Skill

• Validating API request bodies (headers, params, JSON).
• Handling Form submissions in Frontend.
• Validating configuration (Environment variables).
• Parsing unknown data (e.g., external API responses).
• Implementing "Parse, don't validate" philosophy.

Tools & Libraries

• TypeScript First: Zod (Recommended standard).
• Legacy/JS: Joi, Yup.
• Runtime: Ajv (JSON Schema).

Core Concepts