RaiseJs

Raise JavaScript errors as Ruby exceptions in your Rails app.

Add these lines to your Gemfile:

# Raise JavaScript errors as Ruby exceptions
gem "raise_js"

And add raise_js to your Gemfile along with jquery and jquery_ujs:

//= require raise_js
//= require jquery
//= require jquery_ujs

Use a gem like exception_notification to send you an email whenever Rails raises exceptions.

If you want to catch it manually, you can catch RaiseJs::JavaScriptError.