JS debugging in a rails project

I saw some videos on your site about this, but they were more about how the debugger works than how to really set it up.  I am working on a ruby/rails project and I have scripts in both my .html.erb files as well as stand alone JS files.  I then have a Rails config that I typically launch, is there a way to debug JS from there?  Is there a basic setup guide that will give me a step by step on how to debug the JS?  I would really  like to not have to user the browser tools to do this anymore.

Regards, Guy