Of course, JSON doesn't support complex numbers, bignums, rationals, cryptographic keys &c. And it'd be even worse than XML to try to represent programs in. J

Of course, JSON doesn't support complex numbers, bignums, rationals, cryptographic keys &c. And it'd be even worse than XML to try to represent programs in. JSON is definitely easier to decompose into a simple-to-manipulate bag-of-values than is XML.