libjson-pp-perl 4.04000-1 (amd64 binary) in ubuntu focal

 JSON::PP is a module for manipulating data stored in the JavaScript Object
 Notation (JSON) serialization format (defined in RFC 4627), which serves as
 an alternative to XML.
 .
 This Pure Perl JSON implementation will become a core module beginning with
 perl 5.13, and will be loaded by the JSON module (see libjson-perl) if the
 C/XS-accelerated version (see libjson-xs-perl) is not available.