Client Server Communication - Best practice

Hi,

I have a question about using serializable objects vs JSON.

The tutorials demonstrate the use of JSON for client server
communication as well as serialized objects.
My question concerns is there a best practice around using JSON vs
serialized objects? When would one be better using JSON?

My data can be constructed quite simply using a java Map of
ints ,longs, Strings etc or by instantiating a simple object and
making it serializable..I don'tt see the benefit of using JSON unless
there is some performance reason?

Any help appreciated...

Thanks,

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