v0
ui
React Hook Form Field Not Registering or Updating
React Hook Form fields don't register properly, values don't update, or form state doesn't sync with inputs. Form submission doesn't include the field data.
Field registration fails when register() isn't called, watched values aren't properly accessed, or component structure conflicts with form context.
Error Messages You Might See
Field value is undefined
Field not registering
Form submission missing field
[React Hook Form] Field not found
Common Causes
- Forgetting to call register() on inputs: <input {...register('name')} />
- Using Controller for uncontrolled components without proper field binding
- Watching values before form initializes or in wrong scope
- Custom component not spreading register props correctly
- Field registered with wrong name, not matching schema
How to Fix It
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.
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Get HelpFrequently Asked Questions
What's the difference between register and Controller?
register: simple inputs. Controller: custom/complex components. Both achieve same goal, different syntax.
How do I set initial form values?
Use defaultValues in useForm: useForm({ defaultValues: { name: 'John' } }). Values sync automatically.
How do I debug form state?
Install @hookform/devtools, add <DevTool control={control} /> at end of form. Shows all field values in real-time.