NAME
    JSON::Schema - validate JSON against a schema

SYNOPSIS
     my $validator = JSON::Schema->new($schema, %options);
     my $json      = from_json( ... );
     my $result    = $validator->validate($json);
 
     if ($result)
     {
       print "Valid!\n";
     }
     else
     {
       print "Errors\n";
            print " - $_\n" foreach $result->errors;
     }

DESCRIPTION
  Constructors
    "JSON::Schema->new($schema, %options)"
        Given a JSON (or equivalent Perl nested hashref/arrayref structure)
        Schema, returns a Perl object capable of checking objects against
        that schema.

        Note that some schemas contain '$ref' properties which act as
        inclusions; this module does not expand those, but the JSON::Hyper
        module can.

        The only option currently supported is 'format' which takes a
        hashref of formats (section 5.23 of the current JSON Schema draft)
        such that the keys are the names of the formats, and the values are
        regular expressions or callback functions. %JSON::Schema::FORMATS
        provides a library of useful format checkers, but by default no
        format checkers are used.

         my $s = JSON::Schema->new($schema,
                                   format => \%JSON::Schema::FORMATS);

    "JSON::Schema->detect($url)"
        Given the URL for a JSON instance (or an HTTP::Response object)
        returns a list of schemas (as JSON::Schema objects) that the JSON
        instance claims to conform to, detected from the HTTP response
        headers.

  Methods
    "validate($object)"
        Validates the object against the schema and returns a
        JSON::Schema::Result.

    "schema"
        Returns the original schema as a hashref/arrayref structure.

    "format"
        Returns the hashref of format checkers.

    "ua"
        Returns the LWP::UserAgent that this schema object has used or would
        use to retrieve content from the web.

  Perl Specifics
    Perl uses weak typing. This module largely gives JSON instances the
    benefit of the doubt. For example, if something looks like a number
    (e.g. a string which only includes the digits 0 to 9) then it will
    validate against schemas that require a number.

    The module extends JSON Schema's native set of types ('string',
    'number', 'integer', 'boolean', 'array', 'object', 'null', 'any') with
    any Perl package name. i.e. the following is valid:

      my $validator = JSON::Schema->new({
        properties => { 
          'time' => { type => ['DateTime','string'] },
             },
      });
      my $object = {
        'time' => DateTime->now;
      };
      my $result = $schema->validate($object);

    This extension makes JSON::Schema useful not just for validating JSON
    structures, but acyclic Perl structures generally.

    Acyclic. Yes, acyclic. You don't want an infinite loop.

BUGS
    Please report any bugs to <http://rt.cpan.org/>.

SEE ALSO
    JSON::Schema::Result, JSON::Schema::Error, JSON::Schema::Helper,
    JSON::Schema::Null, JSON::Schema::Examples.

    Related modules: JSON::T, JSON::Path, JSON::GRDDL, JSON::Hyper.

    <http://tools.ietf.org/html/draft-zyp-json-schema>.

AUTHOR
    Toby Inkster <tobyink@cpan.org>.

    This is largely a port of Kris Zyp's Javascript JSON Schema validator
    <http://code.google.com/p/jsonschema/>.

COPYRIGHT AND LICENCE
    Copyright 2007-2009 Kris Zyp.

    Copyright 2010-2011 Toby Inkster.

    This module is tri-licensed. It is available under the X11 (a.k.a. MIT)
    licence; you can also redistribute it and/or modify it under the same
    terms as Perl itself.

  a.k.a. "The MIT Licence"
    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the
    "Software"), to deal in the Software without restriction, including
    without limitation the rights to use, copy, modify, merge, publish,
    distribute, sublicense, and/or sell copies of the Software, and to
    permit persons to whom the Software is furnished to do so, subject to
    the following conditions:

    The above copyright notice and this permission notice shall be included
    in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
    IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
    CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
    TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
    SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.