I find mine most simple and flexible, but I think because I know every function.
It's just not completly done yet and I adjust to my project if needed.
I cant explain it, because Im not good in and my bad english... But that you see in description.
Actually, we do almost the same.
The only difference, my server is Smartfox.
I have to work with quite large json, with 10+ entrys and deep of 5+, like "params.characters.look.hair.color" as one entry.
Exactly for this I build my plugin.
With the other json plugins I have found, I had problems.
If you find a good one to handle json in/output, let me know...