api respond_with json


So let say I created this class with the following method that responds to xml or json.

class UsersController < ApplicationController::Base

  respond_to :html, :xml, :json

  def index     respond_with(@users = User.all)   end

  def create     @user = User.create(params[:user])     respond_with(@user, :location => users_url)   end end

How do I call the create action from another app to interact with this user controller class?

Is their any api package I use to do the call on create or something?

Thanks for any help.