rack-jsonp-middleware

takes any JSON response and format all the values (but null) to string whenever the proper header value is set.

Overview

If you are using Bundler you can easily add the following line to your Gemfile:

gem 'rack-json_stringify'

Or you can just install it as a ruby gem by running:

$ gem install rack-json_stringify

In your config/application.rb file add:

require 'rack/json_stringify'

And, within the config block:

config.middleware.use Rack::JsonStringify

Same as for Rails 3 but modifying the config/environment.rb file instead.

In your config.ru file add the following lines:

require 'rack/json_stringify'
use Rack::JsonStringify

You can also clone the project with Git by running: $ git clone git://github.com/robertodecurnex/rack-json_stringify

{"key":1}

Then http://domain.com/action.json with the X-ACCEPTED-TYPES=String will return:

{"key":"1"}