(update: misunderstood question)

googling CPAN JSON spits out

• JSON
  http://search.cpan.org/perldoc?JSON
  JSON::PP was earlier included in the JSON distribution, but has since Perl 5.14 been a core module. For this reason, JSON::PP was removed from the JSON ...
• JSON::XS
  http://search.cpan.org/perldoc?JSON::XS
  This module converts Perl data structures to JSON and vice versa. Its primary goal is to be correct and its secondary goal is to be fast. To reach the latter goal it ...
• JSON::PP
  http://search.cpan.org/perldoc?JSON%3A%3APP
  JSON::XS is the fastest and most proper JSON module on CPAN. It is written by Marc Lehmann in C, so must be compiled and installed in the used environment.

These modules have already been discussed in the past, plz look these discussions up and formulate new deeper questions if necessary.

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