Thank you for help.
Regarding JSON, I tried exacly your example, but it fails.
<JsCode:WARN> Evaluator error: Function 'JSON.stringify' call failed in routing.js:2:
var obj = {};
var str = JSON.stringify(obj);
obj = JSON.parse(str);
Looks like I dont have JSON at all, any call fails.
I Tried this:
Engine.output("JSON module: " + JSON);
Engine.output("File module: " + File);
and get output:
JSON module:
File module: [object File]