Some help please with Ajax source

Currently I am building an html table and applying .dataTable() to the DOM table element. This is great, and easy.

I would like to follow the example on this page http://www.datatables.net/examples/data_sources/ajax.html in order to generate the table using a json source. However, I'm unsure of how to format the html table in json? I'm sorry I'm new to this, and would appreciate any help.

Thanks,
Abram