If I have a block of code like this:

def show
  @post = Post.find(params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.xml  { render :xml => @post }
    end
  end

How do I add something like

format.json

Any tips, pointers, ideas gladly welcomed...

ruby-on-rails json respond-to
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