# Handling the Remote Response

Handle the response to a remote method call asynchronously in the remote method callback function.

Your callback function receives the following parameters:

- `event` object representing the status of the remote call
- `result` object returned by the remote Apex method.

Your function can update information and user interface elements on the page based on the data returned.

The `event` object provides values that let you act upon the success or failure of the remote call.

| Field           | Description                                                                                                 |
| --------------- | ----------------------------------------------------------------------------------------------------------- |
| `event.status`  | `true` on success, `false` on error.                                                                        |
| `event.type`    | The type of the response: `rpc` for a successful call, `exception` if the remote method threw an exception. |
| `event.message` | Contains any error message that is returned.                                                                |
| `event.where`   | The Apex stack trace is referenced, if it is generated by the remote method.                                |

Apex primitive data types returned by `result`—such as strings or numbers—are converted to their JavaScript equivalents. Apex objects that are returned are converted to JavaScript objects, while collections are converted to a JavaScript array. Keep in mind that JavaScript is case-sensitive, so `id`, `Id`, and `ID` are considered different fields.

As part of a JavaScript remote call, if the Apex method response contains references to the same object., the object is not duplicated in the returned JavaScript object. Instead, the rendered JavaScript object contains a reference to the same object. An example is an Apex method which returns a list that contains the same object twice.