I've used Data::Javascript to serialize data and pass it between a pure perl screen scraping application and an IIS/JScript (ASP) web page.

You just have a couple lines of code to serialize/deserialize the data. Better yet, the dependency libraries required are less than any comparable method, because you're using the language itself as the serialization format (like Data::Dumper).

eval'ing foreign code is a big security hole, but I figured that simply including a passphrase in the payload and using https was good enough for an intranet apps.