NAME

Mojo::JSON - Minimalistic JSON

SYNOPSIS

  use Mojo::JSON qw(decode_json encode_json);

  # Encode and decode JSON (die on errors)
  my $bytes = encode_json({foo => [1, 2], bar => 'hello!', baz => \1});
  my $hash  = decode_json($bytes);

  # Handle errors
  my $json = Mojo::JSON->new;
  my $hash = $json->decode($bytes);
  my $err  = $json->error;
  say $err ? "Error: $err" : $hash->{message};

DESCRIPTION

Mojo::JSON is a minimalistic and possibly the fastest pure-Perl implementation of RFC 7159.

It supports normal Perl data types like Scalar, Array reference, Hash reference and will try to call the TO_JSON method on blessed references, or stringify them if it doesn't exist. Differentiating between strings and numbers in Perl is hard, depending on how it has been used, a Scalar can be both at the same time. Since numeric comparisons on strings are very unlikely to happen intentionally, the numeric value always gets priority, so any Scalar that has been used in numeric context is considered a number.

  [1, -2, 3]     -> [1, -2, 3]
  {"foo": "bar"} -> {foo => 'bar'}

Literal names will be translated to and from Mojo::JSON constants or a similar native Perl value.

  true  -> Mojo::JSON->true
  false -> Mojo::JSON->false
  null  -> undef

In addition Scalar references will be used to generate booleans, based on if their values are true or false.

  \1 -> true
  \0 -> false

The two Unicode whitespace characters u2028 and u2029 will always be escaped to make JSONP easier.

FUNCTIONS

Mojo::JSON implements the following functions, which can be imported individually.

decode_json

  my $value = decode_json($bytes);

Decode JSON to Perl value and die if decoding fails.

encode_json

  my $bytes = encode_json({foo => 'bar'});

Encode Perl value to JSON.

j

  my $bytes = j([1, 2, 3]);
  my $bytes = j({foo => 'bar'});
  my $value = j($bytes);

Encode Perl data structure (which may only be an Array reference or Hash reference) or decode JSON, an undef return value indicates a bare null or that decoding failed.

ATTRIBUTES

Mojo::JSON implements the following attributes.

error

  my $err = $json->error;
  $json   = $json->error('Parser error');

Parser error.

METHODS

Mojo::JSON inherits all methods from Mojo::Base and implements the following new ones.

decode

  my $value = $json->decode($bytes);

Decode JSON to Perl value and set "error" if decoding failed.

encode

  my $bytes = $json->encode({foo => 'bar'});