Mojo::JSON(3) Minimalistic JSON


use Mojo::JSON qw(decode_json encode_json);
my $bytes = encode_json {foo => [1, 2], bar => 'hello!', baz => \1};
my $hash = decode_json $bytes;


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, and the character "/" to prevent XSS attacks.

  "\x{2028}\x{2029}</script>" -> "\u2028\u2029<\/script>"


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


  my $value = decode_json $bytes;

Decode JSON to Perl value and die if decoding fails.


  my $bytes = encode_json {i => '♥ mojolicious'};

Encode Perl value to JSON.


  my $false = false;

False value, used because Perl has no native equivalent.


  my $value = from_json $chars;

Decode JSON text that is not "UTF-8" encoded to Perl value and die if decoding fails.


  my $bytes = j [1, 2, 3];
  my $bytes = j {i => '♥ mojolicious'};
  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.


  my $chars = to_json {i => '♥ mojolicious'};

Encode Perl value to JSON text without "UTF-8" encoding it.


  my $true = true;

True value, used because Perl has no native equivalent.