Best you provide an SSCCE of what you want to achieve.

Moose is compatible to use plain Perl classes so I'm not sure what the requirements are.

The devil is in the details of the actual JSON semantics and what

> adds object specific methods, some internal logic, processing" etc

is supposed to mean.

edit

normally a converted JSON structure consists of a tree of nested Array's and Hashes and probably blessed Booleans.

• Do you want Perl wrapper objects for special serializations?
• Or a walker to search that tree?

Please be more specific.