> For the complete documentation index, see [llms.txt](https://docs.imerit.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.imerit.net/data/importing-and-exporting-annotations/exporting-annotations/ango-export-format/stage-history.md).

# Stage History

The `stageHistory` object is part of the [`task`](/data/importing-and-exporting-annotations/exporting-annotations/ango-export-format/asset/task.md) object in the Ango Annotation Format.

Each asset, in Ango Hub, goes through workflow stages. The `stageHistory` object contains a 'snapshot' of the `task` object of the asset as it left each stage before the stage of which the export was taken.

For example, if the asset went through *Start*, then a *Label* stage, then *Review* then *Complete*, and you get the export of all assets in the *Complete* stage, the `stageHistory` object of all assets in the export will contain the `task` object of the asset as it left each previous stage, so *Start*, *Label*, and *Review*.

## General Structure

{% code fullWidth="true" %}

```json
"stageHistory" : [
    { <task object of asset as it was in first stage },
    { <task object of asset as it was in second stage },
    { ... }
]
```

{% endcode %}

<details>

<summary>Sample Stage History</summary>

```json
{
  "stageHistory": [
    {
      "stage": "Start",
      "stageId": "Start",
      "duration": 0,
      "completedAt": "2023-09-01T08:03:00.751Z",
      "tools": [],
      "classifications": [],
      "relations": []
    },
    {
      "stage": "Label",
      "stageId": "Label",
      "duration": 8217,
      "completedAt": "2023-09-01T08:05:21.104Z",
      "completedBy": "lorenzo@example.net",
      "tools": [
        {
          "bounding-box": {
            "x": 311.9559633027523,
            "y": 239.8383838383839,
            "height": 220.44444444444446,
            "width": 132.40366972477065
          },
          "objectId": "3d94d5ead7fcc14859ee425",
          "classifications": [],
          "schemaId": "b1c6805d054f0e44ae11500",
          "title": "bb"
        }
      ],
      "classifications": [],
      "relations": [],
      "brushDataUrl": "https://angohub-private-assets.s3.eu-central-1.amazonaws.com/64f19ab4c54a4d0015562a8f-1693555519699.png?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Credential=AKIATAGM6WLISC5CRH7S%2F20230906%2Feu-central-1%2Fs3%2Faws4_request&X-Amz-Date=20230906T103943Z&X-Amz-Expires=120000&X-Amz-Signature=5d45f1475af4c9bdfa420c8c528ec132438b393ebfa81fd3cb20fc1f534a99b7&X-Amz-SignedHeaders=host&x-id=GetObject"
    }
  ]
}
```

</details>


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