Howells

var jsonString = '{"x": {"y": [2,3]}, "t": [3,5]}'; var obj = JSON.parse(jsonString); var arr = []; arr.push(obj.x.y) arr.push(obj.t) console.log(arr); I was wondering the same thing when I was working on https://www.slotozilla.com/free-slots/silver-lion .Don't create your json yourself, most languages have functions to turn your object/array into a valid json, so just create your object as you normally do and then use that function as in Javascript JSON.stringify().