# `PUT /labeltemplate/{id}`

Protected. Requires a valid session cookie (`credentials: 'include'`).

Update label template

Replaces an existing label template.
When `content` (or `width`/`height`) is provided, the thumbnail is automatically re-rendered.


## Path parameters

| Param | Required | Type | Description |
|-------|----------|------|-------------|
| `id` | yes | integer | Label template ID |

## Body (JSON)

| Field | Required | Type | Description |
|-------|----------|------|-------------|
| `name` | no | string |  |
| `width` | no | number |  |
| `height` | no | number |  |
| `dpi` | no | integer |  |
| `type` | no | string |  |
| `content` | no | LabelContent |  |

```json
{
  "name": "…",
  "width": 1,
  "height": 1,
  "dpi": 1,
  "type": "…",
  "content": {
    "objects": [
      {
        "id": "…",
        "type": "textbox",
        "x": 1,
        "y": 1,
        "w": 1,
        "h": 1,
        "text": "…",
        "font": "…",
        "fontSize": 1,
        "barcodeFormat": "EAN8"
      }
    ]
  }
}
```

## Response `200`

Updated label template

```json
{
  "labeltemplate": {
    "id": 1,
    "name": "…",
    "width": 1,
    "height": 1,
    "dpi": 1,
    "type": "…",
    "content": {
      "objects": [
        {
          "id": "…",
          "type": "textbox",
          "x": 1,
          "y": 1,
          "w": 1,
          "h": 1,
          "text": "…",
          "font": "…",
          "fontSize": 1,
          "barcodeFormat": "EAN8"
        }
      ]
    },
    "thumb": "…"
  }
}
```

## Errors

| Status | Description |
|--------|-------------|
| 400 | Invalid input — `{"error":"…"}` |
| 401 | Unauthorized — `{"error":"…"}` |
| 404 | Label template not found — `{"error":"…"}` |

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