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The metadata-json-lint tool validates and lints metadata.json files in Puppet modules against style guidelines from the Puppet Forge module metadata recommendations.


metadata-json-lint is compatible with Ruby versions 2.0.0, 2.1.9, 2.3.1, and 2.4.1.


via gem command:

gem install metadata-json-lint

via Gemfile:

gem 'metadata-json-lint'


Testing with metadata-json-lint

On the command line, run metadata-json-lint with the path of your metadata.json file:

metadata-json-lint /path/to/metadata.json

Testing with metadata-json-lint as a Rake task

If you are already using puppet_spec_helper, the 'validate' task already includes metadata-json-lint.

You can also integrate metadata-json-lint checks into your tests using the Rake task. Add require 'metadata-json-lint/rake_task' to your Rakefile, and then run:

rake metadata_lint

To set options for the Rake task, include them when you define the task:

require 'metadata_json_lint'
task :metadata_lint do
  MetadataJsonLint.parse('metadata.json') do |options|
      options.strict_license = false

Alternatively, set the option after requiring the Rake task:

require 'metadata-json-lint/rake_task'
MetadataJsonLint.options.strict_license = false


  • --[no-]strict-dependencies: Whether to fail if module version dependencies are open-ended. Defaults to false.
  • --[no-]strict-license: Whether to fail on strict license check. Defaults to true.
  • --[no-]fail-on-warnings: Whether to fail on warnings. Defaults to true.
  • --[no-]strict-puppet-version: Whether to fail if Puppet version requirements are open-ended or no longer supported. Defaults to false.


A big thank you to the contributors.

Making a new release

How to make a new release?

  • update the gemspec file with the desired version
$ git diff
diff --git a/metadata-json-lint.gemspec b/metadata-json-lint.gemspec
index c86668e..6a3ad38 100644
--- a/metadata-json-lint.gemspec
+++ b/metadata-json-lint.gemspec
@@ -2,7 +2,7 @@ require 'date' do |s|        = 'metadata-json-lint'
-  s.version     = '2.4.0'
+  s.version     = '2.5.0'        =
   s.summary     = 'metadata-json-lint /path/to/metadata.json'
   s.description = 'Utility to verify Puppet metadata.json files'
  • export a GitHub access token as environment variable:
  • Install deps and generate the changelog
$ bundle install --path .vendor/ --jobs=$(nproc) --with release
$ bundle exec rake changelog
Found 25 tags
Fetching tags dates: 25/25
Sorting tags...
Received issues: 103
Pull Request count: 77
Filtered pull requests: 72
Filtered issues: 26
Fetching events for issues and PR: 98
Fetching closed dates for issues: 98/98
Fetching SHAs for tags: 25
Associating PRs with tags: 72/72
Generating entry...
Generated log placed in ~/metadata-json-lint/
  • Check the diff for Does it contain a breaking change but the new version is only a minor bump? Does the new release only contains bug fixes? Adjust the version properly while honouring semantic versioning. If required, regenerate the Afterwards submit it as a PR.

  • If it gets approved, merge the PR, create a git tag on that and push it.