# Classifications

The `classifications` 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. It contains all annotation data pertaining to labels created with *classifications*, e.g. not tools, relations, or brushes.

## General Structure

{% code fullWidth="true" %}

```json
"classifications" : [
    {
        answer // object OR list, classification answers
        objectId // string, ID of the classification
        schemaId, // string, ID of the classification class in the project
        classifications, // list, nested classifications
        title // string, title of the classification
        page // int, optional, if asset is multi-page, page where the classification takes place
        tool // string, name of the tool (radio, dropdown, etc.)
        metadata // dict, optional, metadata regarding the annotation (creation date, etc.)
        interpolationStopped // bool, optional, whether in multi-frame assets the classification disappears from this frame on
    },
    { ... }
]
```

{% endcode %}

### Common Properties

<table data-full-width="true"><thead><tr><th width="201">Property</th><th width="90.33333333333331">Type</th><th>Description</th></tr></thead><tbody><tr><td><code>objectId</code></td><td>String</td><td><p>Object ID of the classification. Unique in the asset.</p><pre class="language-json"><code class="lang-json">"objectId": "6b8a4338d299c63b5ee7825"
</code></pre></td></tr><tr><td><code>schemaId</code></td><td>String</td><td><p>ID of the class to which the classification belongs.</p><pre class="language-json"><code class="lang-json">"schemaId": "4460fa700ef030c4e575604"
</code></pre></td></tr><tr><td><code>tool</code></td><td>String</td><td>Type of classification.</td></tr><tr><td><code>title</code></td><td>String</td><td><p>Name of the class.</p><pre class="language-json"><code class="lang-json">"title": "Image Projection Type"
</code></pre></td></tr><tr><td><code>metadata</code></td><td>Dict</td><td>Only appears if the <em>Annotation Metadata</em> toggle has been turned on before export.<br><br><code>createdAt</code>: int, Time of creation in Unix epoch time in milliseconds. GMT.<br><code>createdBy</code>: string, email of user creating the classification<br><code>createdIn</code>: string, ID of the stage in which the classification was first answered.<br><code>updatedAt</code>: int, optional. Time of last classification update in Unix millisecond epoch time. GMT. Only appears if answer has been updated.<br><code>updatedBy</code>: string, optional. email of user last updating the classification. Only appears if answer has been updated.<br><code>updatedIn</code>: string, optional. ID of the stage in which the classification was last updated. Only appears if answer has been updated.</td></tr><tr><td><code>classifications</code></td><td>List</td><td><p>List of nested classifications (if any). May contain further nested classifications in its own <code>classifications</code> property.</p><pre class="language-json"><code class="lang-json">"classifications": [    
{
      "objectId": "78d263ed59db8dd1dcb4666",
      "schemaId": "4460fa700ef030c4e575604",
      "tool": "radio",
      "title": "Nested Radio",
      "answer": "1",
      "metadata": {
        "createdAt": "2023-09-05T10:28:18.667Z",
        "createdBy": "lorenzo@example.net",
        "createdIn": "Complete"
     },
    "classifications": []
  }
]
</code></pre></td></tr></tbody></table>

## Radio

```json
{
    "objectId": "a390f9434a330d14cf16759",
    "schemaId": "4460fa700ef030c4e575604",
    "tool": "radio",
    "title": "Image Projection Type",
    "answer": "Orthogonal",
    "metadata": {
        "createdAt": "2023-09-05T10:32:57.760Z",
        "createdBy": "lorenzo@example.net",
        "createdIn": "194e870c-5255-4ec9-9e6d-392321e504c3"
    },
    "classifications": []
}
```

<table data-full-width="true"><thead><tr><th width="201">Property</th><th width="90.33333333333331">Type</th><th>Description</th></tr></thead><tbody><tr><td><code>answer</code></td><td>String</td><td><p>The answer picked by the annotator.</p><pre><code>"answer": "Red"
</code></pre></td></tr></tbody></table>

{% hint style="info" %}
**See also**

[Radio](/labeling/labeling-tools/classification-tools/radio.md)
{% endhint %}

## Checkbox

```json
{
    "objectId": "5ad8ed43d4c036e799fd617",
    "schemaId": "1ea7a275ce5c9cf30a6f148",
    "tool": "checkbox",
    "title": "Vehicle Color(s)",
    "answer": [
        "Red",
        "Yellow"
    ],
    "metadata": {
        "createdAt": "2023-09-06T07:34:23.618Z",
        "createdBy": "lorenzo@example.net",
        "createdIn": "Complete",
        "updatedAt": "2023-09-06T07:34:24.877Z",
        "updatedBy": "lorenzo@example.net",
        "updatedIn": "Complete"
    },
    "classifications": []
}
```

<table data-full-width="true"><thead><tr><th width="201">Property</th><th width="90.33333333333331">Type</th><th>Description</th></tr></thead><tbody><tr><td><code>answer</code></td><td>List</td><td><p>The answer(s) picked. Always a list, even if only one item was selected.</p><pre class="language-json"><code class="lang-json">"answer": [
    "Red",
    "Yellow"
]
</code></pre></td></tr></tbody></table>

{% hint style="info" %}
**See also**

[Checkbox](/labeling/labeling-tools/classification-tools/checkbox.md)
{% endhint %}

## Single-Select Dropdown

```json
{
    "objectId": "9bca9ffa05869a4b60d9751",
    "schemaId": "a2b4a50bb90eb6523b88376",
    "tool": "single-dropdown",
    "title": "Image Projection Type",
    "answer": "Orthogonal",
    "metadata": {
        "createdAt": "2023-09-06T07:34:29.751Z",
        "createdBy": "lorenzo@example.net",
        "createdIn": "Complete"
    },
    "classifications": []
}
```

<table data-full-width="true"><thead><tr><th width="201">Property</th><th width="90.33333333333331">Type</th><th>Description</th></tr></thead><tbody><tr><td><code>answer</code></td><td>String</td><td><p>The answer picked by the annotator.</p><pre class="language-json"><code class="lang-json">"answer": "Orthogonal"
</code></pre></td></tr></tbody></table>

{% hint style="info" %}
**See also**

[Single-Select Dropdown](/labeling/labeling-tools/classification-tools/single-dropdown.md)
{% endhint %}

## Multi-Select Dropdown

```json
{
    "objectId": "23d2beed0c3958e02d9c315",
    "schemaId": "11f6ed8e4ac4852d3422341",
    "tool": "multi-dropdown",
    "title": "Vehicle Colors",
    "answer": [
        "Red",
        "Yellow"
    ],
    "metadata": {
        "createdAt": "2023-09-06T07:34:32.316Z",
        "createdBy": "lorenzo@example.net",
        "createdIn": "Complete",
        "updatedAt": "2023-09-06T07:34:32.599Z",
        "updatedBy": "lorenzo@example.net",
        "updatedIn": "Complete"
    },
    "classifications": []
}
```

<table data-full-width="true"><thead><tr><th width="201">Property</th><th width="90.33333333333331">Type</th><th>Description</th></tr></thead><tbody><tr><td><code>answer</code></td><td>List</td><td><p>The answer(s) picked. Always a list, even if only one item was selected.</p><pre class="language-json"><code class="lang-json">"answer": [
    "Red",
    "Yellow"
]
</code></pre></td></tr></tbody></table>

{% hint style="info" %}
**See also**

[Multi-Select Dropdown](/labeling/labeling-tools/classification-tools/multiple-dropdown.md)
{% endhint %}

## Tree Dropdown

```json
{
    "objectId": "2c786a2d76113b135f7a680",
    "schemaId": "c2b5eb27e55b186f84f3898",
    "tool": "tree-dropdown",
    "title": "Vehicle Color",
    "answer": [
        "Red",
        "Yellows / Dark Yellow"
    ],
    "metadata": {
        "createdAt": "2023-09-06T07:34:36.681Z",
        "createdBy": "lorenzo@example.net",
        "createdIn": "Complete",
        "updatedAt": "2023-09-06T07:34:39.489Z",
        "updatedBy": "lorenzo@example.net",
        "updatedIn": "Complete"
    },
    "classifications": []
}
```

<table data-full-width="true"><thead><tr><th width="201">Property</th><th width="90.33333333333331">Type</th><th>Description</th></tr></thead><tbody><tr><td><code>answer</code></td><td>List</td><td><p>The answer(s) picked. Always a list, even if only one item was selected.</p><pre class="language-json"><code class="lang-json">"answer": [
        "Reds",
        "Yellows / Dark Yellows / Ochre"
]
</code></pre><p>Answers nested within another are displayed after a <code>/</code>. For example, to get the sample above, the annotator selected the following answers in the UI:<br><img src="/files/VieRGZGvb5rNM4fetmJO" alt=""></p></td></tr></tbody></table>

{% hint style="info" %}
**See also**

[Tree Dropdown](/labeling/labeling-tools/classification-tools/tree-dropdown.md)
{% endhint %}

## Text

```json
{
    "objectId": "4ff3710fd7cdc644b7dd283",
    "schemaId": "6590a72d09f1760a4578032",
    "tool": "text",
    "title": "txt",
    "answer": "Answer Text Here",
    "metadata": {
        "createdAt": "2023-09-06T07:34:41.283Z",
        "createdBy": "lorenzo@example.net",
        "createdIn": "Complete",
        "updatedAt": "2023-09-06T07:34:42.430Z",
        "updatedBy": "lorenzo@example.net",
        "updatedIn": "Complete"
    },
    "classifications": []
}
```

<table data-full-width="true"><thead><tr><th width="201">Property</th><th width="90.33333333333331">Type</th><th>Description</th></tr></thead><tbody><tr><td><code>answer</code></td><td>String</td><td><p>The answer written by the annotator.</p><pre class="language-json"><code class="lang-json">"answer": "6 Chained Street, Military Academy District, Ankara, Turkey"
</code></pre></td></tr></tbody></table>

{% hint style="info" %}
**See also**

[Text](/labeling/labeling-tools/classification-tools/text.md)
{% endhint %}

## File Upload Box

```json
{
    "objectId": "b0f7f4c7f7e14d2a8b3fcb42",
    "schemaId": "58af1b9c7f334a939afbbf89",
    "tool": "upload-box",
    "title": "Upload supporting file",
    "answer": "https://example-bucket.s3.amazonaws.com/project-id/upload-box/task-id/evidence.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256...",
    "metadata": {
        "createdAt": "2026-04-29T10:32:57.760Z",
        "createdBy": "lorenzo@example.net",
        "createdIn": "194e870c-5255-4ec9-9e6d-392321e504c3"
    },
    "classifications": []
}
```

<table data-full-width="true"><thead><tr><th width="201">Property</th><th width="90.33333333333331">Type</th><th>Description</th></tr></thead><tbody><tr><td><code>answer</code></td><td>String</td><td><p>A signed URL to the file uploaded through the upload box.</p><p>The URL is generated during export and may expire.</p></td></tr></tbody></table>

{% hint style="info" %}
**See also**

[File Upload Box](/labeling/labeling-tools/data/file-upload-box.md)
{% endhint %}


---

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