Json2Html.rb

require 'erb'
require 'net/http'
require 'json'

template = %q{
  This is one: <%= data_obj.one %>
  The foo is <%= data_obj.foo %>
}

class MyDataObj
  def initialize(url)
    @url = URI(url)
  end
  def fetch
    contents = Net::HTTP.get(@uri)
    @json = JSON.parse(contents)
    self
  end
  def foo
    @json['foo'] rescue ''
  end
  def one
    @json['one'] rescue ''
  end
end

data_obj = MyDataObj.new('http://example.com/api.json').fetch
puts ERB.new(template).result binding