# `POST /attributevalue/{id}/image`

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

Add or replace attribute value image

Uploads an image for the attribute value (AVIF, WebP, or octet-stream). Converted to AVIF full and thumbnail.
Replaces any existing image for this attribute value. Emits SSE signal `attributename`.


## Path parameters

| Param | Required | Type | Description |
|-------|----------|------|-------------|
| `id` | yes | integer | Attribute value id |

## Body

Raw binary (`image/avif`).

Raw binary (`image/webp`).

Raw binary (`application/octet-stream`).

## Signals

On success, emits SSE signal: `attributename` (see [`GET /events`](../events.md)).

## Response `201`

Image stored and linked

```json
{
  "attributevalue": {
    "id": 1,
    "fullHash": "…",
    "thumbW": 1,
    "thumbH": 1,
    "thumbHash": "…",
    "pics": [
      {
        "fullHash": "…",
        "thumbW": 1,
        "thumbH": 1,
        "thumbHash": "…"
      }
    ]
  }
}
```

## Errors

| Status | Description |
|--------|-------------|
| 400 | Missing body or invalid image — `{"error":"…"}` |
| 401 | Unauthorized — `{"error":"…"}` |
| 403 | Not authorized — `{"error":"…"}` |
| 404 | Attribute value not found — `{"error":"…"}` |

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