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    JSON is hugely popular, yet very simple. This has led to various
    extensions or variants of JSON.

    An overwhelmingly popular extension is comments, because JSON is used a
    lot in configuration. Another popular extension is dangling (trailing)
    comma.

    This list catalogs the various JSON variants which have a Perl
    implementation on CPAN.

    1) JSON5. <https://json5.org/>, "JSON for Humans". Allowing more
    whitespaces, single-line comment (C++-style), multiline comment
    (C-style), single quote for strings, hexadecimal number literal (e.g.
    0x123abc), leading decimal point, trailing decimal point, positive sign
    in number, trailing commas.

    Perl modules: JSON5, File::Serialize::Serializer::JSON5.

    2) HJSON. <https://hjson.org>, Human JSON. A JSON variant that aims to
    be more user-friendly by allowing comments, unquoted keys, and optional
    commas. It's designed to be easier to read and write by humans.

    Perl modules: (none so far).

    3) JSONC. <https://github.com/komkom/jsonc>. JSON with Comments. Also
    allows unquoted string values with whitespace as delimiters.

    Perl modules: (none so far).

    4) jsonc.
    <https://code.visualstudio.com/docs/languages/json#_json-with-comments>.
    Another "JSON with Comments", supported by Microsoft Visual Code.

    Perl modules: (none so far).

    5) CSON. <https://github.com/bevry/cson>. CofeeScript Object Notation.
    JSON-like data serialization format inspired by CoffeeScript syntax. It
    allows for a more concise representation of data by leveraging
    CoffeeScript's features such as significant whitespace and optional
    commas.

    Perl modules: (none so far).

    6) RJSON. <https://relaxedjson.org/>. Relaxed JSON. Trailing commas,
    Optional commas, comments (C-style and C++-style), single-quoted &
    backtick-quoted strings as well as bare/unquoted, hash key without value
    (value will default to "undef"). It touts itself as "going beyond other
    JSON variants, including JSON5."

    Perl modules: JSON::Relaxed.

    7) JSON::Diffable. Basically just allowing for trailing commas.

    8) JSONLines. <https://jsonlines.org>. A more restrictive JSON format,
    all JSON records must fit in one line as newline is the record
    delimiter. Encoding must be UTF-8. Convention for line-oriented
    processing which support JSON. E.g. for CSV replacement.

    Perl moduless: JSON::Lines.

    9) YAML. <https://yaml.org/>. YAML is a superset of JSON. It allows for
    indentation-based syntax and various features like references, heredocs,
    etc.

    Perl modules: YAML, YAML::PP, among others.

ACME::CPANMODULES ENTRIES
    JSON5
        Author: KARUPA <https://metacpan.org/author/KARUPA>

    File::Serialize::Serializer::JSON5
        Author: YANICK <https://metacpan.org/author/YANICK>

    JSON::Relaxed
        Author: JV <https://metacpan.org/author/JV>

    JSON::Diffable
        Author: PHAYLON <https://metacpan.org/author/PHAYLON>

    JSON::Lines
        Author: LNATION <https://metacpan.org/author/LNATION>

    YAML
        Author: INGY <https://metacpan.org/author/INGY>

    YAML::PP
        Author: TINITA <https://metacpan.org/author/TINITA>

FAQ
  What is an Acme::CPANModules::* module?
    An Acme::CPANModules::* module, like this module, contains just a list
    of module names that share a common characteristics. It is a way to
    categorize modules and document CPAN. See Acme::CPANModules for more
    details.

  What are ways to use this Acme::CPANModules module?
    Aside from reading this Acme::CPANModules module's POD documentation,
    you can install all the listed modules (entries) using cpanm-cpanmodules
    script (from App::cpanm::cpanmodules distribution):

     % cpanm-cpanmodules -n JSONVariants

    Alternatively you can use the cpanmodules CLI (from App::cpanmodules
    distribution):

        % cpanmodules ls-entries JSONVariants | cpanm -n

    or Acme::CM::Get:

        % perl -MAcme::CM::Get=JSONVariants -E'say $_->{module} for @{ $LIST->{entries} }' | cpanm -n

    or directly:

        % perl -MAcme::CPANModules::JSONVariants -E'say $_->{module} for @{ $Acme::CPANModules::JSONVariants::LIST->{entries} }' | cpanm -n

    This Acme::CPANModules module also helps lcpan produce a more meaningful
    result for "lcpan related-mods" command when it comes to finding related
    modules for the modules listed in this Acme::CPANModules module. See
    App::lcpan::Cmd::related_mods for more details on how "related modules"
    are found.