# File lib/rabl/engine.rb, line 228
    def format_json(json_output)
      json_engine = Rabl.configuration.json_engine
      json_method = json_engine.respond_to?(:dump) ? 'dump' : 'encode' # multi_json compatibility TODO
      json_output = json_engine.send(json_method, json_output) unless json_output.is_a?(String)
      use_callback = Rabl.configuration.enable_json_callbacks && request_params[:callback].present?
      use_callback ? "#{request_params[:callback]}(#{json_output})" : json_output
    end