json on premier cep Parsing issue

hi , 
i'm trying to parse array from js to jsx 
the pasring works Great with Aftereffects CEP
however in Premier pro it doesn't work if the data came from

i simplified the code to those lines thisis .jsx 

#include 'json2.js';


function jsontest( ) {
    var randomarray = [3,5,7] ; 
    var arraystrinfied = JSON.stringify(randomarray) ;
    var myJSON = '["shark","fish","dolphin"]' ;
    var obj = JSON.parse(arraystrinfied);    // this doesn't work 
    //var obj = JSON.parse(myJSON);       this works just fine 
    alert(obj[1]); 

}

note that the same code above works fine in After effects 
what is it i'm missing ?