Construct2 JSON AJAX format

For some reason, I can't figure out exactly what format Construct is looking for in order to load an array from Ajax.LastData. I'd like to load a 2 dimensional array, setting the size of the array dynamically.

1) is there a particular delimiter between cells and/or rows?

2) is there a way to count the number of columns/rows based on Ajax.LastData?

Thanks for the help

well, I figured out the answer to my own question:

scirra.com/forum/copy-an-entire-array_topic53153.html