# updateMarker

This method is to update a marker that was previously created by [injectMarker](https://emotiv.gitbook.io/cortex-api/markers/injectmarker).

This method set the end date time of a marker, turning an "instance" marker into an "interval" marker. You can also update the **extras** object.

The marker must belong to a record that is still in progress. You cannot update the marker if the record is already stopped.

## Parameters

| Name        | Type     | Required | Description                                                                                                                                                                  |
| ----------- | -------- | -------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| cortexToken | `string` | yes      | A token returned by [authorize](https://emotiv.gitbook.io/cortex-api/authentication/authorize).                                                                              |
| session     | `string` | yes      | A session id returned by [createSession](https://emotiv.gitbook.io/cortex-api/session/createsession).                                                                        |
| markerId    | `string` | yes      | The id of the marker you want to update. This marker must belong to the current record of the session.                                                                       |
| time        | `number` | yes      | <p>The <strong>end</strong> timestamp of the marker.<br>It is the number of <strong>milliseconds</strong> that have elapsed since 00:00:00 Thursday, 1 January 1970 UTC.</p> |
| extras      | `object` | no       | Any extra information you want to associate with the marker.                                                                                                                 |

## Result

The result is an object containing these fields:

| Name      | Type     | Description                                                                                                                |
| --------- | -------- | -------------------------------------------------------------------------------------------------------------------------- |
| recordId  | `string` | The id of the record this marker belongs to.                                                                               |
| sessionId | `string` | The id of the session associated to the record.                                                                            |
| marker    | `object` | A [marker object](https://emotiv.gitbook.io/cortex-api/markers/marker-object) that represents the marker that was updated. |

## Examples

{% tabs %}
{% tab title="Request" %}

```javascript
{
    "id": 1,
    "jsonrpc": "2.0",
    "method": "updateMarker",
    "params": {
        "cortexToken": "xxx",
        "session": "4cbf7554-31bd-4659-ac58-400b823503f0",
        "markerId": "26fccfd8-e487-4623-910a-1ba8591fcdcf",
        "time": 1559811469531
    }
}
```

{% endtab %}

{% tab title="Response" %}

```javascript
{
    "id": 1,
    "jsonrpc": "2.0",
    "result": {
        "marker": {
            "endDatetime": "2019-06-06T15:57:49.530743+07:00",
            "extras": {},
            "label": "test2",
            "port": "Cortex Example",
            "startDatetime": "2019-06-06T15:57:41.529661+07:00",
            "type": "interval",
            "uuid": "26fccfd8-e487-4623-910a-1ba8591fcdcf",
            "value": 42
        },
        "recordId": "db01c15e-d916-4a7b-9f1d-16295fd1c643",
        "sessionId": "4cbf7554-31bd-4659-ac58-400b823503f0"
    }
}
```

{% endtab %}
{% endtabs %}