Convert String to JsonArray

Convert String to JsonArray

how to properly convert this String to a jsonArray?
{
"myArray": [
{ "id": 1,
"att1": 14.2,
"att2": false },
{ "id": 2,
"att1": 13.2,
"att2": false },
{ "id": 3,
"att1": 13,
"att2": false }
]}
An JSONArray jArray = new JSONArray(STRING_FROM_ABOVE); results in
jArray.length = 1 Its my first time to get in touch with json :)