JSONBlob

Create <script type="application/json;base64"> tags to safely send data to the UI. You can then use https://github.com/fnando/json_blob-js to load this data on the client-side.

Add this line to your application's Gemfile:

gem "json_blob"

And then execute:

$ bundle

Or install it yourself as:

$ gem install json_blob

To output data, use the json_blob method like the following:

<%= json_blob :user, @user %>

This will output something like:

<script data-name="user" type="application/json;base64">eyJuYW1lIjoiSm9obiBEb2UifQ==</script>

On the client-side you can load the data with something like the following. You're better off using https://github.com/fnando/json_blob-js to avoid copying 'n' pasting code between projects.

function loadJSONBlob(name, defaults = null) {
  const element = document.querySelector(`script[type="application/json;base64"][data-name="${name}"]`);

  if (!element) {
    return defaults;
  }

  return JSON.parse(atob(element.innerHTML));
}

const user = loadJSONBlob("user");

You can use the methods to encode/decode payloads directly.

encoded = JSONBlob.dump(a: 1)
decoded = JSONBlob.parse(encoded)

You can also set your favorite JSON engine. The requirement is that it must implement the dump(data) and parse(data) methods.

module CustomJSONEngine
  def self.dump(data)
    JSON.dump(data.merge(dump: true))
  end

  def self.parse(data)
    JSON.parse(data).merge(parse: true)
  end
end

JSONBlob.json_engine = CustomJSONEngine

encoded = JSONBlob.dump(a: 1)
decoded = JSONBlob.parse(encoded)
#=> {"a" => 1, "dump": true, "parse": true}

After checking out the repo, run bin/setup to install dependencies. Then, run rake test 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 rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/fnando/json_blob. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.

Everyone interacting in the JSONBlob project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.