Have you printed out your JSON data string at the receiving end to see what you get there? An empty string gives the same error message:
>perl -MJSON -e "print JSON->new->decode('')"
malformed JSON string, neither array, object, number, string or atom,
+at character offset 0 (before "(end of string)") at -e line 1.
I think you are trying to pass the data around in a very bad manner:
If you send POST data, please read HTTP::Request on how to send POST data. If you want to send the data in an URI, please encode it properly using URI::Encode.
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