Form Validation Toolkit

Stop writing ad-hoc validation logic for every form. This skill gives your AI agent a complete validation toolkit covering schema generation (Zod, Yup, Joi, Valibot), accessible error displays (WCAG 2.1 AA), input sanitization (XSS/injection prevention), and framework integrations (React Hook Form, Formik, VeeValidate). Includes ready-to-use validators for emails, passwords, phones, credit cards, URLs, dates, and file uploads. Covers multi-step forms, conditional validation, async checks (username availability), cross-field rules (password confirmation), and server-side Express middleware. Every pattern includes working TypeScript code with proper types. One skill handles validation for your entire app.