react-syntax-forms

Build accessible React forms with validation by applying deterministic patterns for controlled and uncontrolled inputs, incorporating ARIA attributes for structure, and using clear validation logic to ensure user input integrity.

Use controlled inputs with value and onChange when you need to manage input state directly in React, and use uncontrolled inputs with defaultValue when letting the DOM handle state for simpler form handling.

React 19 form actions work with useFormStatus and useActionState by allowing you to handle form submission, track pending states, and manage form results directly without manual state synchronization.

Yes, this form handling guidance supports file inputs and useOptimistic, providing deterministic patterns to handle file uploads and optimistic UI updates within React 18 and 19 form structures.

The best way to avoid mixing controlled and uncontrolled patterns in React is to follow structured guidance that clearly separates value/onChange usage from defaultValue, ensuring deterministic behavior and preventing common form pitfalls.

Yes, you can handle pending state without external libraries by using React 19 form actions alongside useActionState and useFormStatus, which provide built-in utilities to track submission status and results deterministically.