# List System Users

Set the `system` parameter to `true` to view system users too. These users are required for administration purposes and cannot be changed or deleted.

{% hint style="info" %}
**Note:** The sample UUID in all following request examples is `498ae72f-411f-11eb-9d07-046c59cc737e`.
{% endhint %}

## Endpoint

Use the following endpoint to get a list of all users, including system users, in your PostgreSQL cluster:

`https://api.ionos.com/databases/postgresql/clusters/{clusterId}/users?system=true`

{% hint style="info" %}
**Note:** The sample UUID is `498ae72f-411f-11eb-9d07-046c59cc737e`.
{% endhint %}

## Request

```bash
curl --request GET \
    --user "clientname@ionos.com:Mb2.r5oHf-0t" \
```

## Response

```json
{
  "id": "c90a5396-1a43-538b-a4c8-564cd0eafc07",
  "items": [
    {
      "id": "6e209957-a468-562e-9867-2a69069044c3",
      "properties": {
        "system": true,
        "username": "ionos_cloud_admin"
      },
      "type": "user"
    },
    {
      "id": "27d4069e-4df9-56cf-8114-1a846589c73a",
      "properties": {
        "system": true,
        "username": "postgres"
      },
      "type": "user"
    },
    {
      "id": "b35402eb-bd7b-512d-92c9-9726db47c101",
      "properties": {
        "system": false,
        "username": "someuser"
      },
      "type": "user"
    },
    {
      "id": "e1ca756d-957e-5e5b-9089-56943078f98c",
      "properties": {
        "system": true,
        "username": "standby"
      },
      "type": "user"
    }
  ],
  "limit": 100,
  "offset": 0,
  "type": "collection"
}
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.ionos.com/cloud/databases/postgresql/api/v1-api/users-and-databases/manage-users/list-system-users.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.