How to change React-Hook-Form defaultValue with useEffect()?

I am creating a page for user to update personal data with React-Hook-Form.
Once paged is loaded, I use useEffect to fetch the user’s current personal data and set them into default value of the form.

I put the fetched value into defaultValue of <Controller />.
However, it is just not showing in the text box.
Here is my code:

import React, {useState, useEffect, useCallback} from 'react';
import { useForm, Controller } from 'react-hook-form'
import { URL } from '../constants';

const UpdateUserData = props => {
    const [userData, setUserData] = useState(null);
    const { handleSubmit, control} = useForm({mode: 'onBlur'});

    const fetchUserData = useCallback(async account => {
        const userData = await fetch(`${URL}/user/${account}`)
                            .then(res=> res.json());
    }, []);

    useEffect(() => {
        const account = localStorage.getItem('account');
    }, [fetchUserData])

    const onSubmit = async (data) => {
        // TODO

    return (
            <form onSubmit={handleSubmit(onSubmit)}>
                    <label>User Name:</label>
                        as={<input type='text' />}
                        defaultValue={userData ? : ''}
                        as={<input type='text' />}
                        defaultValue={userData ? : ''}

export default UpdateUserData;

The called API is working well and the value is actually set to userData state.

  name: "John",
  phone: "02-98541566"

I also tried to setUserData with mock data in useEffect(), and it doesn’t work either.
Is there any problem in my above code?

146 thoughts on “How to change React-Hook-Form defaultValue with useEffect()?”

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