remove unused code in node_helper

[E3V3A]

Remove the following unused code from node_helper.js:

// To check if something is JSON
function isJSON(str) {
    try { return (JSON.parse(str) && !!str); }
    catch (e) { return false; }
}

// To check if something is an Array or Object (parsed JSON)
function isAO(val) {
    return val instanceof Array || val instanceof Object ? true : false;
}

// --------------------------------------------------------------------------
// What:  A dirt simple JSON cleanup function that also compactifies the data
// NOTE:  - Only use on flat and trustworthy ASCII JSON data!
//        - Cannot handle any characters outside [A-Za-z0-9_\-]. (e.g. UTF-8)
//        - Using remote data without further sanitation is a security risk!
// --------------------------------------------------------------------------
const re1 = /([A-Za-z0-9_\-]+):/gm;  // use const to make sure it is compiled
function jZen(juice) {
    //let re1 = /([A-Za-z0-9_\-]+):/gm; // Find all ASCII words $1 before an ":"
    //let data = juice;
    let str = "";
    str = juice.replace(/\s/gm, '');     // Remove all white-space
    str = str.replace(/\'/gm, '\"');    // Replace all ' with "
    str = str.replace(re1, '\"$1\":');  // Replace $1: with "$1":
    //console.log("Dirty JSON is:\n" + data.toString() );
    //console.log("Clean JSON is:\n" + str);
    return str;
}