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This is a really simple CLI tool to convert between YAML and JSON. It's written in Ruby and allows the full flexibily of whatever Ruby allows you to parse.

Installing the gem provides the following new commands:

  • json2yaml
  • yaml2json


$ gem install yamljson


Convert YAML to JSON

$ yaml2json --input-file /path/to/yaml/file
  • Output is pretty printed by default, to disable this pass the --no-pretty argument: shell $ yaml2json --input-file /path/to/yaml/file --no-pretty

Convert JSON to YAML

$ json2yaml --input-file /path/to/json/file


After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to


To run tests:

bundle install
bundle exec rake spec


Bug reports and pull requests are welcome on GitHub at