# `PUT /auth/selected-company`

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

Set selected company

Sets the authenticated user's selected company.

## Body (JSON)

| Field | Required | Type | Description |
|-------|----------|------|-------------|
| `companyId` | yes | integer |  |

```json
{
  "companyId": 1
}
```

## Signals

On success, emits SSE signals: `user`, `company` (see [`GET /events`](../events.md)).

## Response `200`

Updated user

```json
{
  "user": {
    "id": 1,
    "email": "user@example.com",
    "selectedCompanyId": 1,
    "picture": "…"
  }
}
```

## Errors

| Status | Description |
|--------|-------------|
| 400 | Invalid companyId — `{"error":"…"}` |
| 401 | Unauthorized — `{"error":"…"}` |
| 500 | Server error — `{"error":"…"}` |

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