The WebInspector allows you to inspect a running Sinatra app. Just browse http://localhost:4567/\_\_inspect\_\_
When used with BigBand, it will – per default – only be activated in development mode.
Sinatra::WebInspector is part of the BigBand stack. Check it out if you are looking for other fancy Sinatra extensions.
Note: CSS has not yet been imported from BigBand, so you won't really enjoy this.
gem install sinatra-web-inspector --prerelease
Classic style:
require "sinatra"
configure(:development) { require "sinatra/webinspector" }
Modular style:
require "sinatra/base"
require "sinatra/webinspector"
class Foo < Sintra::Base
configure(:development) { register Sintra::WebInspector }
end