NAME

Data::Sah::Filter::perl::JSON::check_decode_hash - Check that value can be decoded as JSON and it is a hash

VERSION

This document describes version 0.007 of Data::Sah::Filter::perl::JSON::check_decode_hash (from Perl distribution Sah-Schemas-JSON), released on 2022-11-15.

SYNOPSIS

Using in Sah schema's prefilters (or postfilters) clause

 ["str","prefilters",[["JSON::check_decode_hash"]]]

Using with Data::Sah:

 use Data::Sah qw(gen_validator);
 
 my $schema = ["str","prefilters",[["JSON::check_decode_hash"]]];
 my $validator = gen_validator($schema);
 if ($validator->($some_data)) { print 'Valid!' }

Using with Data::Sah:Filter directly:

 use Data::Sah::Filter qw(gen_filter);

 my $filter = gen_filter([["JSON::check_decode_hash"]]);
 # $errmsg will be empty/undef when filtering succeeds
 my ($errmsg, $filtered_value) = $filter->($some_data);

Sample data and filtering results

 "" # INVALID (String is not a valid JSON: malformed JSON string, neither tag, array, object, number, string or atom, at character offset 0 (before "(end of string)") at (eval 2357) line 8. ), unchanged (Empty string is not valid JSON)
 "null" # INVALID (String is a valid JSON but not an encoded hash), unchanged (Valid JSON but not a hash)
 "[1,2,3]" # INVALID (String is a valid JSON but not an encoded hash), unchanged (Valid JSON but not a hash)
 "{\"a\":1}" # valid, unchanged
 "\"foo\"" # INVALID (String is a valid JSON but not an encoded hash), unchanged (Valid JSON but not a hash)
 "\"foo" # INVALID (String is not a valid JSON: unexpected end of string while parsing JSON string, at character offset 4 (before "(end of string)") at (eval 2362) line 8. ), unchanged (Invalid JSON, missing closing quote)
 {} # INVALID (String is not a valid JSON: malformed JSON string, neither tag, array, object, number, string or atom, at character offset 0 (before "HASH(0x559dffd6ec58)") at (eval 2363) line 8. ), unchanged (Will become something like "HASH(0x560142d4e5e8)" and fail because it is not valid JSON)

DESCRIPTION

This is like the JSON::check_decode filter with the additional check that the decoded value is a hash.

HOMEPAGE

Please visit the project's homepage at https://metacpan.org/release/Sah-Schemas-JSON.

SOURCE

Source repository is at https://github.com/perlancar/perl-Sah-Schemas-JSON.

AUTHOR

perlancar <perlancar@cpan.org>

CONTRIBUTING

To contribute, you can send patches by email/via RT, or send pull requests on GitHub.

Most of the time, you don't need to build the distribution yourself. You can simply modify the code, then test via:

 % prove -l

If you want to build the distribution (e.g. to try to install it locally on your system), you can install Dist::Zilla, Dist::Zilla::PluginBundle::Author::PERLANCAR, Pod::Weaver::PluginBundle::Author::PERLANCAR, and sometimes one or two other Dist::Zilla- and/or Pod::Weaver plugins. Any additional steps required beyond that are considered a bug and can be reported to me.

COPYRIGHT AND LICENSE

This software is copyright (c) 2022, 2021 by perlancar <perlancar@cpan.org>.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

BUGS

Please report any bugs or feature requests on the bugtracker website https://rt.cpan.org/Public/Dist/Display.html?Name=Sah-Schemas-JSON

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.

cpanm Sah::Schemas::JSON

perl -MCPAN -e shell
install Sah::Schemas::JSON