```ruby
require "sinatra/base"
require "sinatra/namespace"
require "multi_json"
require "sass"
require "compass"

require "lib/sinatra/response_helper"

module Api
  class Base < ::Sinatra::Base
    register ::Sinatra::ResponseHelper
    register ::Sinatra::Namespace

    # global configuration elements
    configure do
      # do not log; handle these separately
      disable :dump_errors

      # do not capture; throw them up the stack
      enable :raise_errors

      # disable internal middleware for presenting errors as HTML
      disable :show_exceptions
    end

    # run before every request
    before do
      # set content type
      content_type :json
    end

    # global helper methods available to all namespaces
    helpers do
    end
  end
end
```

Add Reloader extension for easier development
user
```ruby
require "sinatra/base"
require "sinatra/reloader"
require "sinatra/namespace"
require "multi_json"
require "sass"
require "compass"

require "lib/sinatra/response_helper"

module Api
  class Base < ::Sinatra::Base
    register ::Sinatra::ResponseHelper
    register ::Sinatra::Namespace

    # global configuration elements
    configure do
      # do not log; handle these separately
      disable :dump_errors

      # do not capture; throw them up the stack
      enable :raise_errors

      # disable internal middleware for presenting errors as HTML
      disable :show_exceptions
    end

    # development environment config
    configure :development do
      register Sinatra::Reloader
    end

    # run before every request
    before do
      # set content type
      content_type :json
    end

    # global helper methods available to all namespaces
    helpers do
    end
  end
end
```
assistant