> For the complete documentation index, see [llms.txt](https://docs.relevant-digital.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.relevant-digital.com/technical/integration/javascript-api/relevantdigital.definevideoslots.md).

# relevantDigital.defineVideoSlots()

Define video slots before calling [relevantDigital.loadPrebid()](/technical/integration/javascript-api/relevantdigital.loadprebid.md). Then use [relevantDigital.loadVideoUrls()](/technical/integration/javascript-api/relevantdigital.loadvideourls.md) to retrieve VAST URLs for your player.

For a complete instream implementation, see [Instream video with HBM and GAM](/technical/integration/formats-and-channels/instream-video-with-hbm-and-gam.md).

{% hint style="info" %}
This API currently supports Google Ad Manager only.
{% endhint %}

### Parameters

Pass an array of video slot settings.

#### `path`

Required. The Google Ad Manager ad unit path, such as `"/12345/articles/pre_roll"`.

#### `id`

Optional. A unique slot ID for [relevantDigital.loadVideoUrls()](/technical/integration/javascript-api/relevantdigital.loadvideourls.md). An ID is generated when omitted.

#### `custParams`

Optional. Custom ad-server targeting parameters.

### Return value

Returns a `VideoSlot` object for each input setting. Use `videoSlot.getSlotElementId()` to retrieve a slot ID.

### Example

```
window.relevantDigital = window.relevantDigital || {};
relevantDigital.cmd = relevantDigital.cmd || [];
relevantDigital.cmd.push(() => {
    const videoSlots = relevantDigital.defineVideoSlots([
        {
           path: '/12345/articles/pre_roll',
           id: 'preroll_1',
           custParams: { 'section': 'articles' },
        },
        {
           path: '/12345/articles/pre_roll',
           id: 'preroll_2',
           custParams: { 'section': 'articles' },
           },
    ]);
    

    // Call relevantDigital.loadPrebid() "as normal"
    relevantDigital.loadPrebid({ ... });
    
    // Get the URLs with VAST XML that should be used with the video player
    relevantDigital.loadVideoUrls(['preroll_1', 'preroll_2'], (vastUrls) => {
       console.info('VAST URLs:', vastUrls);
       // TODO: Invoke video player here
    });
});
```


---

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