wp json api – get posts by category

I solved the problem in a different way. First I extracted all the posts by including category name inside of it. Check the answer below.

public function module_data() {
        global $json_api;
        $url = parse_url($_SERVER['REQUEST_URI']);
        $defaults = array(
            'ignore_sticky_posts' => true,
            'posts_per_page' => -1,
            'order_by' => 'date',
            'order' => 'ASC'
        );
        $query = wp_parse_args($url['query']);
        unset($query['json']);
        unset($query['post_status']);
        $query = array_merge($defaults, $query);
        $posts = $json_api->introspector->get_posts($query);
        $result = $this->posts_result($posts);
        unset($result['pages'], $result['count_total']);
        foreach ($result['posts'] as $key) {
            $key->thumbnail_image = $key->thumbnail_images['thumbnail']->url;
            $key->large_image = $key->thumbnail_images['large']->url;
            $key->category = $key->categories[0]->title;
            //$key->categories
            unset($key->id, $key->type, $key->slug, $key->url, $key->status, $key->title_plain, $key->excerpt, $key->tags, $key->author, $key->comments, $key->custom_fields, $key->comment_status, $key->comment_count, $key->categories, $key->attachments, $key->date, $key->modified, $key->thumbnail, $key->thumbnail_size
                    , $key->thumbnail_images['full'], $key->thumbnail_images['medium'], $key->thumbnail_images['medium_large'], $key->thumbnail_images);
        }
        $result['posts'] = $result['posts'];

        return $result;
    }