React Hook Form Builder

React Hook Form is a performant, flexible library for building forms in React. It uses uncontrolled components and native HTML inputs, minimizing re-renders and improving performance compared to controlled-component approaches like Formik. It integrates seamlessly with TypeScript and validation libraries like Zod, Yup, and Joi.

Zod is a TypeScript-first schema validation library. When paired with React Hook Form via @hookform/resolvers, it provides type-safe validation with auto-inferred TypeScript types from schemas. This means one schema definition covers both runtime validation and compile-time type safety — no duplication.

The register function connects HTML inputs to React Hook Form's state. It returns props (name, ref, onChange, onBlur) that you spread onto an input element. The ref allows React Hook Form to track the value without controlled state, which is why it's so performant — fields don't trigger full re-renders on every keystroke.

Use register for native HTML inputs (input, select, textarea). Use Controller for third-party controlled components like React Select, MUI TextField, or any component that doesn't expose a DOM ref. Controller wraps the component and provides value/onChange/onBlur through render props.

React Hook Form supports 5 validation modes: onChange (validates on every keystroke), onBlur (validates when field loses focus), onSubmit (validates on submit only — default), onTouched (validates on first blur, then on change), and all (validates on all events). onSubmit is fastest; onChange is most responsive but can feel aggressive.