wordpress categories with it depends posts (for api)

function.php

<?php 
/**
 * uses : http://examplewp.com/wp-json/wp/v2/categoriesAndDepencyPostList
 * Registers REST API endpoints -- for  accordion tab and categories with it depends posts
 *
 * @since 1.0.0
 */
add_action('rest_api_init', 'register_categoriesAndDepencyPostList1');
function register_categoriesAndDepencyPostList1()
{
    register_rest_route('wp/v2', '/categoriesAndDepencyPostList/',
        array(
            'methods' => 'GET',
            'callback' => 'categoriesAndDepencyPostList1',
            'permission_callback' => function ($request) {
                return is_user_logged_in();
            },
        )
    );

}

/**
 * Gets categories and depency post list 
 *
 * @since 6.2.0
 * @param WP_REST_Request $request The request sent from WP REST API.
 * @return array Gets quiz list
 */
function categoriesAndDepencyPostList1 (WP_REST_Request $request)
{

//   print_r($request->get_params());
    $categories = get_categories(array(
        'orderby' => 'id',
        'order' => 'ASC',
    ));


    $data = [];
    $i = 0;
    foreach ($categories as $key_ => $category) {

  
            $posts_args = array(
                'category__and' => array($category->term_id),
                'post_status' => 'publish',
                'orderby' => 'id',
                'order' => 'ASC',
                'no_found_rows' => true,
            );

            // The Featured Posts query.
            $posts = new WP_Query($posts_args);

            $posts = $posts->get_posts();

            foreach ($posts as $key2 => $post) {
                $random = substr(md5(mt_rand()), 0, 3);
                $data[$i]['catId'] = $category->term_id;
                $data[$i]['catTitle'] = $category->name;
                $data[$i]['key'] = 'st' . $random;
                $data[$i]['posts'][$key2]['postId'] = $post->ID;
                $data[$i]['posts'][$key2]['title'] = get_the_title($post->ID);
            }

            // Reset the post data
            wp_reset_postdata();
            $i++;
        

    }

    return $data;
}