# `GET /category/tree`

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

Category tree

Returns the category tree for the authenticated user's selected company.

## Response `200`

Tree and articles for the selected company

```json
{
  "languageId": 1,
  "tree": [],
  "articles": []
}
```

## Errors

| Status | Description |
|--------|-------------|
| 400 | No company selected — `{"error":"…"}` |
| 401 | Unauthorized — `{"error":"…"}` |
| 403 | Not authorized — `{"error":"…"}` |
| 404 | Company not found — `{"error":"…"}` |

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