ponepaste/assets/app.js

$(function () {
    $('input, select').on('change', function (event) {
        var $element = $(event.target),
            $container = $element.closest('.example');

        if (!$element.data('tagsinput'))
            return;

        var val = $element.val();
        if (val === null)
            val = "null";
        $('code', $('pre.val', $container)).html(($.isArray(val) ? JSON.stringify(val) : "\"" + val.replace('"', '\\"') + "\""));
        $('code', $('pre.items', $container)).html(JSON.stringify($element.tagsinput('items')));
    }).trigger('change');
});