React Hook Form Field Not Registering or Updating

1. Forgetting to call register() on inputs: <input {...register('name')} />
2. Using Controller for uncontrolled components without proper field binding
3. Watching values before form initializes or in wrong scope
4. Custom component not spreading register props correctly
5. Field registered with wrong name, not matching schema

Register fields: Always use register() on inputs: <input {...register('email')} />

For custom components: Use Controller wrapper: <Controller name="custom" control={control} render={({ field }) => <CustomInput {...field} />} />

Watch values: Use hook to watch specific fields: const email = watch('email')

Debug form state: Use DevTools: <DevTool control={control} /> to inspect form state in real-time.