---
title: "CreateAppPreviewSessionBody"
description: "Request body for creating an AppPreviewSession."
section: "Reference"
group: "Types"
order: 30
---

## Definition

```ts
interface CreateAppPreviewSessionBody {
  appVersionId: string;
}
```

## Fields

| Field          | Type     | Notes                                                    |
| -------------- | -------- | -------------------------------------------------------- |
| `appVersionId` | `string` | `required` — App version to start a preview session for. |