1. Make sure you are using Chrome
2. Drag Trona to your bookmark bar.
3. In DevTools / Settings, toggle Enable custom formatters as on.

1. Make sure you are in a Opal Ruby app. (e.g. this page)
2. Click the bookmarklet.
3. From now on, Ruby object log by console will be formatted for easier inspection.
4. Try type Opal.hash({a: 10})in console or Run , and you will see it's formatted as a Hash object.

Why puts not work?

Kernel.puts will transform object to String, thus the output will remain plain text. Require console and use $console.log instead.

require "console"
$console.log({a: 10, foo: :bar})

Will Trona be open sourced?

Yes! Making the tool open sourced is definitely planned :) Feel free to open an issue if you got any problem.