JSON::Tiny - Minimalistic JSON. No dependencies.
use JSON::Tiny 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 = JSON::Tiny->new; my $hash = $json->decode($bytes); my $err = $json->error; say $err ? "Error: $err" : $hash->{message};
JSON::Tiny is a minimalistic standalone adaptation of Mojo::JSON, from the Mojolicious framework. It is a single-source-file module with 316 lines of code and core-only dependencies.
Key features include transparent Unicode support, speed, small memory footprint, and a minimal code base ideal for bundling or inlining. Along with Mojo:JSON, it is possibly the fastest pure-Perl implementation of RFC 7159.
JSON::Tiny 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 unintentionally, the numeric value always gets priority, so any Scalar that has been used in numeric context is considered a number.
Scalar
Array
Hash
[1, -2, 3] -> [1, -2, 3] {"foo": "bar"} -> {foo => 'bar'}
Literal names will be translated to and from JSON::Tiny constants or a similar native Perl value.
true -> JSON::Tiny->true false -> JSON::Tiny->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.
u2028
u2029
JSON::Tiny 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({foo => 'bar'});
Encode Perl value to JSON.
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. Dies if decoding fails.
JSON::Tiny implements the following attributes.
my $err = $json->error; $json = $json->error('Parser error');
Parser errors.
JSON::Tiny implements the following methods.
my $json = JSON::Tiny->new;
Instantiate a JSON::Tiny object.
my $value = $json->decode($bytes);
Decode JSON to Perl value and set "error" if decoding failed.
my $bytes = $json->encode({foo => 'bar'});
my $false = JSON::Tiny->false; my $false = $json->false;
False value, used because Perl has no native equivalent.
my $true = JSON::Tiny->true; my $true = $json->true;
True value, used because Perl has no native equivalent.
A reference to a scalar (even if blessed) will also be encoded as a Boolean value unless it has a TO_JSON method.
my $json = $j->encode( { b => \1, a => \0 } ); # {"b":true,"a":false}
Boolean false and true values returned when JSON is decoded are JSON::Tiny::_Bool objects with stringification and numeric overloading.
As an advanced option, users requiring a plain old literal 0 or 1, may set $JSON::Tiny::FALSE = 0; and $JSON::Tiny::TRUE = 1;. Any value, including blessed references will work. The setting must be made prioror to calling a JSON decoding method or function. Use local to constrain the scope of the change.
0
1
$JSON::Tiny::FALSE = 0;
$JSON::Tiny::TRUE = 1;
local
JSON::Tiny compared with JSON::PP from the JSON distribution:
JSON::PP is configurable, but more complex. JSON::Tiny offers sane defaults, and no configuration.
Download and install with cpanm: JSON::PP, 5.2 seconds. JSON::Tiny, 1.9 seconds.
cpanm
Minimal Dependencies: Both JSON::PP and JSON::Tiny only use core dependencies. JSON::Tiny requires Perl 5.8.4, while JSON::PP requires 5.6.
Simple Design: JSON has 2254 lines of code, six modules and five files. Distribution: 85KB.
JSON::Tiny has under 320 lines of code; a single-file module -- good for embedding. Distribution: 19KB.
JSON::PP has 42 functions and methods. JSON::Tiny has nine.
Performance (Benchmarks):
Rate JSON_PP JSON_Tiny JSON_PP 306/s -- -51% JSON_Tiny 624/s 104% --
JSON uses JSON::XS if it's available, in which case JSON wins. See examples/json_benchmark.pl for benchmark code.
examples/json_benchmark.pl
JSON::Tiny's lightweight design reduces its startup time as compared to the JSON module. This is beneficial to frequently run applications like CGI.
Light Memory Needs: Memory usage was tested with http://valgrind.org/valgrind and Devel::MemoryTrace::Light by running examples/json_pp_alone.pl and examples/json_tiny_alone.pl.
examples/json_pp_alone.pl
examples/json_tiny_alone.pl
valgrind Devel::MemoryTrace::Light JSON::PP 8.0MB 5.9MB JSON::Tiny 7.6MB 5.0MB
No configuration.
Perl 5.8.1 or newer. However, Perl 5.10 is the recommended minimum due to bugs in Perl 5.8's regular expression engine.
Incompatible with Exporter versions that predate Perl 5.8.4. For older Perl versions upgrade Exporter to version 5.59 or newer.
David Oswald, <davido at cpan.org>
<davido at cpan.org>
Code and tests were adapted from Mojo::JSON.
Directed support requests to the author. Direct bug reports to CPAN's Request Tracker (RT).
You can find documentation for this module with the perldoc command.
perldoc JSON::Tiny
You may look for additional information at:
Github: Development is hosted on Github at:
http://www.github.com/daoswald/JSON-Tiny
RT: CPAN's request tracker (bug reports)
http://rt.cpan.org/NoAuth/Bugs.html?Dist=JSON-Tiny
AnnoCPAN: Annotated CPAN documentation
http://annocpan.org/dist/JSON-Tiny
CPAN Ratings
http://cpanratings.perl.org/d/JSON-Tiny
Search CPAN
http://search.cpan.org/dist/JSON-Tiny/
The Mojolicious team for their excellent product that offers a lightweight JSON implementation. This module was adapted directly from Mojo::JSON, chosen as a model because it is robust, minimal, and well tested. Mojo::JSON's tests were also adapted to a dependency-free design.
Christian Hansen, whos GitHub Gist provided the basis for Mojo::JSON, from which this module is derived.
Randal Schwartz demonstrated a pure-regexp JSON parser (PerlMonks) to Los Angeles Perl Mongers (Sept 2012). He wasn't involved in JSON::Tiny, but my exploration of alternatives to his solution led to this fork of Mojo::JSON.
Copyright 2012-2014 David Oswald.
This program is free software, you can redistribute it and/or modify it under the terms of the Artistic License version 2.0.
See http://www.perlfoundation.org/artistic_license_2_0 for more information.
Mojo::JSON, JSON, RFC 7159.
To install JSON::Tiny, copy and paste the appropriate command in to your terminal.
cpanm JSON::Tiny
CPAN shell
perl -MCPAN -e shell install JSON::Tiny
For more information on module installation, please visit the detailed CPAN module installation guide.