actionscript 3 JSON failed to parse data - json

Question

I have received a JSON data like this:
'{"result":[[["test","test"],["test","test"]],[],[],[]]}'
OR
'{"result":[
[
["test","test"],
["test","test"]
],
[],
[],
[]
]
}'
But when I try to JSON.parse(data);, it is converted to object like this:
{[[["test","test"],["test","test"]],[],[],[]]:}
Is there anyway to fix it?
ADDITIONAL:
i have traced what happen before,during,after JSON do, and the problem seems to be the parse itself, sometime it work, some time doesn't
var object:Object = {test:[[["Test","test1"],["test2"]],["test3"],[],[]]}
var stringed:String = JSON.stringify(object);
trace(stringed)//{"test":[[["Test","test1"],["test2"]],["test3"],[],[]]}
var backed:Object = JSON.parse(stringed);
for each(var thigng:String in backed){
trace(thigng, "=", backed[thigng])//Test,test1,test2,test3,, = undefined
}
var object:Object = {"test":"test3"}
var stringed:String = JSON.stringify(object);
trace(stringed)//{test:"test3"}
var backed:Object = JSON.parse(stringed);
for each(var thigng:String in backed){
trace(thigng, "=", backed[thigng])//test3 = undefined
}

Answer 1

A "for each...in" loop will only give you the value not the key.
What you need is the for in loop.
As you can see from the example below where you went wrong
var object:Object = {"this_is_the_key":"VALUE"}
var stringed:String = JSON.stringify(object);
var backed:Object = JSON.parse(stringed);
for each(var thigng:String in backed){
trace('KEY:', thigng, ' VALUE:' ,backed[thigng]) // KEY: VALUE VALUE: undefined
}
trace('------')
for(thigng in backed){
trace('KEY:', thigng, ' VALUE:' ,backed[thigng]) //KEY: this_is_the_key VALUE: VALUE
}
Also this is not a valid JSON string
'{"result":[[["test","test"],["test","test"]],[],[],[]]}'