Custom route Wordpress API

function.php

add_action('rest_api_init', 'custom_api_get_all_posts');

function custom_api_get_all_posts()
{
    register_rest_route('custom/v1', '/all-posts', array(
        'methods' => WP_REST_Server::READABLE,
        'callback' => 'custom_api_get_all_posts_callback'
    ));
}

// custom Route API 
function custom_api_get_all_posts_callback(WP_REST_Request $request)
{
    // Initializearray untuk menerima Post data
    $posts_data = array();
    // Menerima Parameter Dari $request untuk melakukan paginations
    $paged = $request->get_param('page');
    $paged = (isset($paged) || !(empty($paged))) ? $paged : 1;
    // Mengambil Semua data Posts dan postype dengan terbaru di awal (DESC)
    $query = new WP_Query(
        array(
            'paged' => $paged,
            'post__not_in' => get_option('sticky_posts'),
            'posts_per_page' => 10,
            'post_type' => array('post') // Type Post apa saja yang di ijinkan masuk. 
        )
    );

    // if no posts found return 
    if (empty($query->posts)) {
        return new WP_Error('no_posts', __('No post found'), array('status' => 404));
    }

    // set max number of pages and total num of posts
    $max_pages = $query->max_num_pages;
    $total = $query->found_posts;

    $posts = $query->posts;

    // prepare data for output
    $controller = new WP_REST_Posts_Controller('post');

    foreach ($posts as $post) {

        $response = $controller->prepare_item_for_response($post, $request);
        $post_data = $controller->prepare_response_for_collection($response);
        $post_thumbnail = (has_post_thumbnail($post_data['id'])) ? get_the_post_thumbnail_url($post_data['id']) : null;

        $data[] = (object) array(
            'id' => $post_data['id'],
            'slug' => $post_data['title']['rendered'],
            'date' => $post->post_date,
            'author' => get_the_author_meta('user_nicename', $post->post_author),
            'type' => $post->post_type,
            'title' => $post->post_title,
            'url' => get_permalink($post_data['id']),
            'content' => $post_data['excerpt']['rendered'],
            'featured_img_src' => $post_thumbnail,
            'meta' => get_post_meta($post_data['id'], '', '')

        );
    }

    // set headers and return response      
    $response = new WP_REST_Response($data, 200);

    $response->header('X-WP-Total', $total);
    $response->header('X-WP-TotalPages', $max_pages);

    return $response;
}