form-validation

Real-time form validation in React combines React Hook Form with Zod for schema-based validation. Use zodResolver to connect your Zod schema to React Hook Form, enable mode: 'onChange' for instant feedback as users type, and display validated error messages directly in your form UI.

Yes, React Hook Form with Zod resolver supports multi-step forms through field-level validation and Controller-based inputs. Validate each step's fields independently, maintain form state across steps, and apply Zod schemas that enforce constraints at each stage.

Define your Zod validation schema with Korean error messages in the refinement or custom error objects. React Hook Form will display these localized messages when validation fails, providing user-friendly feedback in Korean.

Controller wraps third-party UI components to make them work with React Hook Form's validation system, while uncontrolled components register directly. Use Controller for complex inputs like Select or DatePicker; use register for native HTML inputs.

No, React Hook Form manages onChange events internally with mode: 'onChange' enabled. The framework automatically triggers validation on each keystroke and updates form state, eliminating manual event handler boilerplate.

Zod supports type checking, string length, email and URL formats, number ranges, regex patterns, custom refinements, and conditional validation. Combine these rules to create comprehensive schemas that validate user input against your business requirements.