NAME

   Mojo::JSON::MaybeXS - use JSON::MaybeXS as the JSON encoder for
   Mojolicious

SYNOPSIS

    use Mojo::JSON::MaybeXS;
    use Mojo::JSON qw/encode_json decode_json true false/;

    # Preload for scripts using Mojo::JSON
    $ perl -MMojo::JSON::MaybeXS -S morbo myapp.pl

    # Must be set in environment for hypnotoad
    $ PERL5OPT=-MMojo::JSON::MaybeXS hypnotoad myapp.pl

DESCRIPTION

   Mojo::JSON::MaybeXS is a monkey-patch module for using JSON::MaybeXS as
   the JSON encoder for a Mojolicious application, or anything else using
   Mojo::JSON. It must be loaded before Mojo::JSON so the new functions
   will be properly exported.

CAVEATS

   JSON::MaybeXS may load different modules behind the scenes depending on
   what is available, and these modules have slightly different behavior
   from Mojo::JSON and occasionally from each other. References to the
   behavior of JSON::MaybeXS below are actually describing the behavior
   shared among the modules it loads.

   JSON::MaybeXS is used with the options canonical, allow_nonref,
   allow_unknown, allow_blessed, and convert_blessed. canonical enables
   sorting of hash keys when encoding to JSON objects as Mojo::JSON does.
   allow_nonref allows encoding and decoding of bare values outside of
   hash/array references, since Mojo::JSON does not prevent this, in
   accordance with RFC 7159 <http://tools.ietf.org/html/rfc7159>. The
   other options prevent the encoder from blowing up when encountering
   values that cannot be represented in JSON to better match the behavior
   of Mojo::JSON; in most cases, where Mojo::JSON would stringify a
   reference, JSON::MaybeXS with these settings will encode it to null.
   See below for more specifics.

   To better match the behavior of Mojo::JSON, certain options may be
   enabled depending on the backend that is used. If Cpanel::JSON::XS
   version 3.0112 or greater is loaded, it will be used with the option
   stringify_infnan. If either Cpanel::JSON::XS of at least version 3.0206
   or JSON::PP is loaded, it will be used with the option escape_slash.

   As of this writing, the author has found the following
   incompatibilities:

Object Conversion

   Both JSON::MaybeXS and Mojo::JSON will attempt to call the TO_JSON
   method of a blessed reference to produce a JSON-friendly structure. If
   that method does not exist, Mojo::JSON or Cpanel::JSON::XS version
   3.0207 or greater will stringify the object, while JSON::XS or JSON::PP
   will always encode it to null.

    print encode_json([DateTime->now]);
    # Mojo::JSON or Cpanel::JSON::XS >= 3.0207: ["2014-11-30T04:31:13"]
    # JSON::XS or JSON::PP: [null]

Unblessed References

   JSON::MaybeXS does not allow unblessed references other than to hashes,
   arrays, or the scalar values 0 and 1, and will encode them to null.
   Mojo::JSON will treat all scalar references the same as references to 0
   or 1 and will encode them to true or false depending on their boolean
   value. Other references (code, filehandle, etc) will be stringified.

    print encode_json([\'asdf', sub { 1 }]);
    # Mojo::JSON: [true,"CODE(0x11d1650)"]
    # JSON::MaybeXS: [null,null]

Escapes

   Mojo::JSON currently escapes the slash character / for security
   reasons, as well as the unicode characters u2028 and u2029.
   Cpanel::JSON::XS version 3.0206 or greater and JSON::PP will have the
   option set to escape the slash character, and JSON::XS does not escape
   these characters. This does not affect decoding of the resulting JSON.

    print encode_json(["/\x{2028}/\x{2029}"]);
    # Mojo::JSON: ["\/\u2028\/\u2029"]
    # Cpanel::JSON::XS >= 3.0206 or JSON::PP: ["\/ \/ "]
    # JSON::XS: ["/ / "]
    # Both decode to arrayref containing: "/\x{2028}/\x{2029}"

inf and nan

   Mojo::JSON encodes inf and nan to strings. Cpanel::JSON::XS version
   3.0112 or greater will also stringify inf and nan. However, JSON::XS or
   JSON::PP will encode them as numbers (barewords) producing invalid
   JSON.

    print encode_json([9**9**9, -sin 9**9**9]);
    # Mojo::JSON or Cpanel::JSON::XS >= 3.0112: ["inf","nan"] (on Linux)
    # JSON::XS or JSON::PP: [inf,nan]

Upgraded Numbers

   JSON::MaybeXS, if using JSON::XS or JSON::PP, will attempt to guess if
   a value to be encoded is numeric or string based on its last usage.
   Therefore, using a variable containing 13 in a string will cause it to
   be encoded as "13" even if the variable itself was not changed.
   Mojo::JSON or Cpanel::JSON::XS version 3.0109 or greater will encode 13
   as 13 regardless of whether it has been used as a string.

    my ($num1, $num2) = (13, 14);
    my $str = "$num1";
    print encode_json([$num1, $num2, $str]);
    # Mojo::JSON or Cpanel::JSON::XS >= 3.0109: [13,14,"13"]
    # JSON::XS or JSON::PP: ["13",14,"13"]

BUGS

   This is a monkey-patch of one of a few possible modules into another,
   and they have incompatibilities, so there will probably be bugs. Report
   any issues on the public bugtracker.

AUTHOR

   Dan Book, [email protected]

CREDITS

   Sebastian Riedel, author of Mojolicious, for basic implementation.

COPYRIGHT AND LICENSE

   Copyright 2014, Dan Book.

   This library is free software; you may redistribute it and/or modify it
   under the terms of the Artistic License version 2.0.

SEE ALSO

   Mojo::JSON, JSON::MaybeXS, Cpanel::JSON::XS, JSON::XS, JSON::PP

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