// add this to functions.php
//register acf fields to Wordpress API

function acf_to_rest_api($response, $post, $request) {
    if (!function_exists('get_fields')) return $response;

    if (isset($post)) {
        $acf = get_fields($post->id);
        $response->data['acf'] = $acf;
    return $response;
add_filter('rest_prepare_post', 'acf_to_rest_api', 10, 3);
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