# `GET /entity`

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

List entities

Lists entities for the selected company. Optional `customergroupId`
query filters to one group (must belong to the company).


## Query parameters

| Param | Required | Type | Description |
|-------|----------|------|-------------|
| `customergroupId` | no | integer |  |

## Response `200`

Entity list

```json
{
  "entities": [
    {
      "id": 1,
      "customergroupId": 1,
      "firstName": "…",
      "name": "…",
      "createdAt": "2026-08-10T00:00:00.000Z",
      "updatedAt": "2026-08-10T00:00:00.000Z"
    }
  ]
}
```

## Errors

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

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