---
title: Visitor ID
slug: web-experimentation/api/kzxe-visitor-id
docTags: 
createdAt: 2026-08-05T20:56:13.000Z
---

### Syntax

```javascript
visitor_id = window["optimizely"].get("visitor_id");
```

### Parameters

| Parameter and Type       | Child Attribute | Description                                                        |
| ------------------------ | --------------- | ------------------------------------------------------------------ |
| **visitor\_id** *string* | N/A             | The argument indicating to get `visitor_id` information. Required. |

### Return value

| Parameter and Type    | Child Attribute                             | Description                                                                                                              |
| --------------------- | ------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------ |
| *VisitorIdsObject*    | N/A                                         | The visitor ID object contains the visitor ID assigned by Optimizely Web Experimentation.                                |
| **randomId** *string* | Child attribute of type `VisitorIdsObject`. | A randomly generated user ID for the current visitor, which is used by Web Experimentation for calculating your results. |

### Example call

```javascript
visitor_id = window["optimizely"].get("visitor_id");
```

### Example return value

```javascript
{
  "randomId": "oeu1470101898133r0.04568111757824678"
}
```