function recursive(obj) {

    var output = '';

    if (typeof obj === 'object') {

        for (var key in obj) {

            var item = obj[key];

            if (typeof item === 'object') {

                output += recursive(item);

            } else {

                output += key + ':' + item + '\n';

            }

        }

    } else {

        output += obj + '\n';

    }

    return output;

}