Submit form with wp-nonce token using fetch

fetch-with-wp-nonce.js

const formEl = document.querySelector('.form-profile-upd');
formEl.addEventListener('submit', e => {
    e.preventDefault();
    const data = new FormData(formEl);
    const id = window.WP_DATA.USER_ID;
    console.log(data.get('birthday'));
    fetch(`${WP_DATA.ROOT_URL}wp/v2/users/` + id, {
        method: 'POST',
        credentials: 'same-origin',
        body: {
            'meta': {
                'birthday': data.get('birthday')
            }
        },
        headers: {
            'X-WP-Nonce': WP_DATA.WP_NONCE
        }
    })
        .then(res => res.text())
        .then(data => console.log(data));
});