jquery nested ul li

function buildList(data) {
    var $ul = $('<ul></ul>');
    for (const key in data) {
        var $child = $('<li></li>');
        $ul.append($child)
        if (typeof data[key] === 'object') {
            $child.text = $child.text(key);
            $child.append(buildList(data[key]));
        } else {
            $child.text = $child.text(key + ' : ' + data[key]);
        }
    }
    return $ul;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="div_containing_ul"></div>

jQuery(document).ready(function($) {

$.get('url', function(data){

            var $ul = $('<ul></ul>');

            function getList(item, $list) {

                $.each(item, function (key, value) {
                    var $li = $('<li />');
                    $li.append($('<a href="#">' + key + '</a>'));

                    var $subul = $("<ul/>");

                    $.each(value, function(i) {
                        var subli = $('<li/>')
                        .text(value[i])
                        .appendTo(subli);
                    });
                    $subul.append(subli);


                    $li.append($subul)

                });
            }
            getList(data, $ul);
            $ul.appendTo("div_containing_ul");
    });});