http://stackoverflow.com/questions/5240483/how-to-hook-jquery-own-functions-to-check-if-a-string-can-be-evaled-to-a-functi

parseJSONwithFunctions.js

/* Parses JSON with function body as a string into JavaScript object */

var parseJSONwithFunctions = function (JSONdata) {
    var root = document.documentElement,
        sandbox = document.createElement('script'),
        code = "var fn = {", i;

    for (i in JSONdata) {
        if( JSONdata.hasOwnProperty(i) ) {
            code += i + " : " + JSONdata[i] + ",";
        }
    }

    code = code.replace(/,$/, '') + " };";

    try {
        sandbox.appendChild(document.createTextNode(code));
    } catch (e) {
        sandbox.text = code;
    }

    root.insertBefore(sandbox, root.firstChild);
    root.removeChild(sandbox);
    root = sandbox = null;
    
    return fn;
 };

var sampleJSON = { id: "10", getID: "function () { alert(this.id) }" };

BUG: this fails for String data in the JSON