All you could do is highlight it in a similar fashion to how you highlight INI files. Anything on the left of the : is the keyword and anything to the right is the string. Looking at http://json.org/example.html it reminds me of the YAML format but with some more structuring.
-- Carbonize <http://forum.pspad.com/read.php?2,56243,56256> PSPad freeware editor http://www.pspad.com
