A Sinatra example to turn any site into a JSON service

app.rb

require 'rubygems'
require 'sinatra'
require 'httparty'
require 'nokogiri'
require 'json'

class HtmlParserIncluded < HTTParty::Parser
  SupportedFormats.merge!('text/html' => :html)
  def html
    Nokogiri::HTML(body)
  end
end

class Page
  include HTTParty
  parser HtmlParserIncluded
end

get '/' do
  "Here there be cat$"
end

get '/bomb' do
  content_type :json
  count = params[:count].to_i
  count = 5 if count < 1
  page = ((rand * 24) + 1).to_i
  res = Page.get("http://cashcats.biz/page/#{page}")
  cats = res.css('.photo_img').map{|x| x['src']}
  cats = cats.sort_by{ rand }[0...count]
  { cats: cats }.to_json
end

config.ru

# Just deploy these files to Heroku
require './app'
run Sinatra::Application

Gemfile

source :rubygems
gem 'sinatra'
gem 'httparty'
gem 'nokogiri'