/form-validation

name: form-validation
description: >
  Implement form validation using React Hook Form, Formik, Vee-Validate, and
  custom validators. Use when building robust form handling with real-time
  validation.

Form Validation

Table of Contents

• [Overview](#overview)
• [When to Use](#when-to-use)
• [Quick Start](#quick-start)
• [Reference Guides](#reference-guides)
• [Best Practices](#best-practices)

Overview

Implement comprehensive form validation including client-side validation, server-side synchronization, and real-time error feedback with TypeScript type safety.

When to Use

• User input validation
• Form submission handling
• Real-time error feedback
• Complex validation rules
• Multi-step forms

Quick Start

Minimal working example:

// types/form.ts
export interface LoginFormData {
  email: string;
  password: string;
  rememberMe: boolean;
}

export interface RegisterFormData {
  email: string;
  password: string;
  confirmPassword: string;
  name: string;
  terms: boolean;
}

// components/LoginForm.tsx
import { useForm, SubmitHandler } from 'react-hook-form';
import { LoginFormData } from '../types/form';

const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;

export const LoginForm: React.FC = () => {
  const {
    register,
    handleSubmit,
// ... (see reference guides for full implementation)

Reference Guides

Detailed implementations in the `references/` directory:

| Guide | Contents | |---|---| | [React Hook Form with TypeScript](references/react-hook-form-with-typescript.md) | React Hook Form with TypeScript | | [Formik with Yup Validation](references/formik-with-yup-validation.md) | Formik with Yup Validation | | [Vue Vee-Validate](references/vue-vee-validate.md) | Vue Vee-Validate | | [Custom Validator Hook](references/custom-validator-hook.md) | Custom Validator Hook | | [Server-Side Validation Integration](references/server-side-validation-integration.md) | Server-Side Validation Integration |

Best Practices

✅ DO

• Follow established patterns and conventions
• Write clean, maintainable code
• Add appropriate documentation
• Test thoroughly before deploying

❌ DON'T

• Skip testing or validation
• Ignore error handling
• Hard-code configuration values