JSON data is written as name/value pairs.A name/value pair consists of a field name (in double quotes), followed by a colon, followed by a value: "name":"Mark" JSON can use arrays. Array values must be of type string, number, object, array, boolean or null. For example: { "name":"John", "age":30, "cars":["Ford","BMW","Fiat"] } JSON can have empty object like "taskId":{}