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. The string value has a higher precedence unless both representations are equivalent.

  [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'});