Fields in JSON are almost the same as fields in JavaScript. In JSON, field values must be string, number, object, array, boolean, or null. In JavaScript, field values can be all of the above plus any other valid JavaScript expression, including functions, data, and undefined.
Use the JSON.parse() method to insert a JSON array, eg JSON.parse(arr). The method parses a JSON string and returns its JavaScript value or object equivalent. If the specified parameter is not valid JSON, the JSON.parse method throws a SyntaxError exception
myJSON = '["Ford", "BMW", "Fiat"]';
myArray = JSON.Parse(myJSON);