code: public RequestContext renderData(final Object data) {
          if (renderer instanceof JsonRenderer) {
              final JsonRenderer r = (JsonRenderer) renderer;
  
              final JSONObject ret = r.getJSONObject();
              ret.put(Keys.DATA, data);
          }
  
          return this;
      }
docs: Renders with {"data": obj}.
  
  @param data the specified JSON data
  @return this context