ajax - render json not showing up in view on rails 4 -

i have form set (remote: true submit via ajax) user can input email , zipcode. if record gets validated model , saved triggers javascript script changes dom accordingly notify user of success. however, if record not pass validation want errors via json server , display them in div near form. cant "else" part of loop work , json render on view.

in chrome dev tools, when try submit blank form, status 200 , response

{"email":["is invalid"],"zip":["is not number","is short (minimum 5 characters)"]}"  

but how can these errors controller show in view?

controller----------------------------------------------->

class engagescontroller < applicationcontroller    def     @sub = subscriber.new   end    def create     @sub = subscriber.new(subscriber_params)      respond_to |format|       if @sub.save         format.html { render 'now', notice: 'user created.'     }         format.js   {}       else         format.json { render :json => @sub.errors }       end     end   end         private   def subscriber_params     params.require(:engage).permit(:email, :zip)   end  end 

model---------------------------------------------------->

class subscriber < activerecord::base    validates_format_of :email, :with => /\a([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]    {2,})\z/i   validates :zip, numericality: {only_integer: true}, length: {minimum: 5}  end 

instead of rendering json, use

format.js { render 'errors', errors: @subs.errors }

and need write view file named errors.js.erb in displaying errors in using javascript code.