JSFiddle - React, Tailwind, and code Playground

HTML

<html>
<body>
    <script>
        var d = '{"a":"BEG[                              ]END"}';
        var jso = jQuery.parseJSON( d );
    </script>
</body>
</html>

JavaScript

$.parseJSON = function (data) {
            if (typeof data !== "string" || !data) {
                return null;
            }

            if ($.browser.msie){ // workaround 
                // Make sure leading/trailing whitespace is removed (IE can't handle it)
                data = jQuery.trim(data);
            }

            // Make sure the incoming data is actual JSON
            // Logic borrowed from http://json.org/json2.js
            if (/^[\],:{}\s]*$/.test(data.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, "@")
            .replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, "]")
            .replace(/(?:^|:|,)(?:\s*\[)+/g, ""))) {

                // Try to use the native JSON parser first
                return window.JSON && window.JSON.parse ?
                window.JSON.parse(data) :
                (new Function("return " + data))();

            } else {
                jQuery.error("Invalid JSON: " + data);
            }
        };