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JSON::Infer cpan:JSTOWE last updated on 2019-02-21



Create Perl6 classes to represent JSON data by some dodgy inference.


Use the script to do it simply:

# Create the module in the directory "foo"

p6-json-infer --uri= --out-dir=foo --class-name=Mixcloud::Show

Or do it in your own code:

use JSON::Infer;

my $obj =
my $ret = $obj.infer(uri => '', class-name => 'Mixcloud::Show');

say $ret.make-class; # Print the class definition


JSON is nearly ubiquitous on the internet, developers love it for making APIs. However the webservices that use it for transfer of data rarely have a machine readable specification that can be turned into code so developers who want to consume these services usually have to make the client definition themselves.

This module aims to provide a way to generate Perl 6 classes that can represent the data from a JSON source. The structure and the types of the data is inferred from a single data item so the accuracy may depend on the consistency of the data.


Assuming you have a working Perl 6 installation you should be able to install this with zef :

# From the source directory

zef install .

# Remote installation

zef install JSON::Infer

Other install mechanisms may be become available in the future.


Suggestions/patches are welcomed via github at


This is free software.

Please see the LICENCE file in the distribution for details.

© Jonathan Stowe 2015, 2016, 2017, 2019