# Add department member

Add a user to a department.

Adds an existing organization member to a department. The user must already be a member of the organization. A user cannot be added to the same department twice.

#### Path Parameters

**`organization_id`** string required

The unique identifier of the organization (format: `org_*`).

**`department_id`** string required

The unique identifier of the department (format: `dept_*`).

#### Request Body

**`user_id`** string required

The ID of the user to add to the department (format: `usr_*`). The user must be a member of the organization.

## Returns

The department member object with a `201 Created` status code.

Request

```bash cURL
curl -X POST https://api.aitronos.com/v1/organizations/org_xyz789/departments/dept_abc123/members \
  -H "Authorization: Bearer $ACCESS_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "user_id": "usr_def456"
  }'
```


```python Python SDK
from aitronos import Aitronos

client = Aitronos(api_key="your-api-key")

# Department endpoints coming to SDK soon
# result = client.departments.add_member(
#     organization_id="org_xyz789",
#     department_id="dept_abc123",
#     user_id="usr_def456",
# )
```


```python Python
import requests

org_id = "org_xyz789"
dept_id = "dept_abc123"
url = f"https://api.aitronos.com/v1/organizations/{org_id}/departments/{dept_id}/members"
headers = {
    "Authorization": "Bearer YOUR_ACCESS_TOKEN",
    "Content-Type": "application/json",
}
data = {"user_id": "usr_def456"}

response = requests.post(url, headers=headers, json=data)
member = response.json()
print(member)
```


```javascript JavaScript
const orgId = "org_xyz789";
const deptId = "dept_abc123";

const response = await fetch(
  `https://api.aitronos.com/v1/organizations/${orgId}/departments/${deptId}/members`,
  {
    method: "POST",
    headers: {
      "Authorization": `Bearer ${accessToken}`,
      "Content-Type": "application/json",
    },
    body: JSON.stringify({ user_id: "usr_def456" }),
  }
);

const member = await response.json();
console.log(member);
```

Response

```json 201 Created
{
  "user_id": "usr_def456",
  "full_name": "Jane Smith",
  "email": "jane@company.com",
  "added_at": null
}
```


```json 409 Error
{
  "success": false,
  "error": {
    "code": "DEPARTMENT_MEMBERSHIP_DUPLICATE",
    "message": "This user is already a member of the department.",
    "system_message": "Department membership duplicate",
    "type": "client_error",
    "status": 409,
    "details": {
      "user_id": "usr_def456",
      "department_id": "dept_abc123"
    },
    "trace_id": "abc-123-def",
    "timestamp": "2025-11-02T08:21:45Z"
  }
}
```


```json 404 Error — Member Not Found
{
  "success": false,
  "error": {
    "code": "MEMBER_NOT_FOUND",
    "message": "The specified user is not a member of this organization.",
    "system_message": "User is not a member of this organization",
    "type": "client_error",
    "status": 404,
    "details": { "user_id": "usr_invalid" },
    "trace_id": "abc-123-def",
    "timestamp": "2025-11-02T08:21:45Z"
  }
}
```

## Related Resources

- [Get Department Tree](/docs/api-reference/departments/tree)
- [List Departments](/docs/api-reference/departments/list)
- [Retrieve Department](/docs/api-reference/departments/retrieve)
- [Create Department](/docs/api-reference/departments/create)
- [Update Department](/docs/api-reference/departments/update)
- [Reparent Department](/docs/api-reference/departments/reparent)
- [Delete Department](/docs/api-reference/departments/delete)
- [List Department Members](/docs/api-reference/departments/list-members)
- [Remove Department Member](/docs/api-reference/departments/remove-member)
- [Department Object](/docs/api-reference/objects/department-object)