You need to call adoptJSONArray() on the ClipboardPage object that represents the clipboard page on which you want your data to be parsed and made available. This method takes two parameters. First is a string that holds the JSON array. Second is the name of a pagelist property to which the JSON array will be mapped.

For example, 

String jsonArray = "[{\"name\":\"foo\"}, {\"name\":\"bar\"}]";

You want this JSON to be mapped to an embedded pagelist property called Names inside myStepPage (a ClipboardPage object onto which you want your data to be mapped), then you need to call (inside a try-catch block):

myStepPage.adoptJSONArray(jsonArray, "Names");