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  package mylib::json;
  use Exporter 'import';
...
    eval { $j = JSON::XS->new->encode($o); };
    return $@ ? undef : $j;
  }

  package mylib;
  use Exporter 'import';
  use lib 'mylib';
  use mylib::json;
  our @EXPORT = ( @mylib::json::EXPORT );

  use strict;
  use warnings;
  use lib '.';
  use mylib;
  print jsonEncode({foo => 'bar'});

  use strict;
  use warnings;
...
  use mylib;
  use JSON::WebToken;
  print jsonEncode({foo => 'bar'});

Attempt to call undefined import method with arguments ("encode_json" 
+...) via package "JSON" (Perhaps you forgot to load the package?) at 
+C:/Strawberry/perl/site/lib/JSON/WebToken.pm line 12.