I am experimenting with Rails and was wondering what's needed to allow/add support for JSON requests?

I have a vanilla installation of Rails 2.3.5 and the default scaffolding seem to provide support for HTML & XML requests but not JSON.

class EventsController < ApplicationController
  # GET /events
  # GET /events.xml
  def index
    @events = Event.all

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

  # GET /events/1
  # GET /events/1.xml
  def show
    @event = Event.find(params[:id])

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

...

I'm new to this but it would appear as though i would need to add a format line in each method along the lines of:

format.js  { render :js => @event.json }

couldn't this be done automatically? perhaps there's a template somewhere i need to update...or a flag i can set? Or perhaps, and most likely, I've missed the boat entirely?!?