Add /delayed_jobs.json.

Leave out `handler` because it's sensitive.

app/controllers/delayed_jobs_controller.rb

@@ -1,5 +1,7 @@
 class DelayedJobsController < ApplicationController
+  respond_to :html, :xml, :json
   def index
     @delayed_jobs = Delayed::Job.order("created_at desc").paginate(params[:page], :limit => params[:limit])
+    respond_with(@delayed_jobs)
   end
 end

config/initializers/active_record_api_extensions.rb

@@ -26,6 +26,12 @@ module Danbooru
   end
 end
 
+class Delayed::Job
+  def hidden_attributes
+    [:handler]
+  end
+end
+
 class ActiveRecord::Base
   include Danbooru::Extensions::ActiveRecordApi
 end