> ## Documentation Index
> Fetch the complete documentation index at: https://learn.nexudus.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Get one ValidationRule

> Retrieve a single ValidationRule record by its Id.

A **ValidationRule** defines a custom business rule that validates data before it is saved. Rules can be applied to various record types (coworkers, bookings, contracts, visitors, etc.) and enforce custom conditions beyond the standard field validations.

## Authentication

<Note>
  This endpoint requires OAuth2 authentication. Include a valid bearer token in the `Authorization` header.
  The authenticated user must be a full unrestricted administrator or have the **`ValidationRule-Read`** role.
</Note>

## Path Parameters

<ParamField path="id" type="integer" required>
  The Id of the ValidationRule record to retrieve.
</ParamField>

## Code Examples

<CodeGroup>
  ```bash cURL theme={null}
  curl -X GET \
    "https://spaces.nexudus.com/api/sys/validationrules/87654321" \
    -H "Authorization: Bearer YOUR_TOKEN"
  ```

  ```javascript JavaScript theme={null}
  const response = await fetch(
    'https://spaces.nexudus.com/api/sys/validationrules/87654321',
    {
      headers: {
        'Authorization': 'Bearer YOUR_TOKEN'
      }
    }
  );

  const record = await response.json();
  ```

  ```python Python theme={null}
  import requests

  response = requests.get(
      'https://spaces.nexudus.com/api/sys/validationrules/87654321',
      headers={
          'Authorization': 'Bearer YOUR_TOKEN'
      }
  )

  record = response.json()
  ```
</CodeGroup>

## Response

### 200

<ResponseField name="BusinessId" type="integer">
  ID of the business linked to this record.
</ResponseField>

<ResponseField name="Name" type="string">
  The name value for this validation rule.
</ResponseField>

<ResponseField name="RecordType" type="integer">
  The record type value for this validation rule. See `eValidationRuleEntity` enum values: `1` = Coworker, `2` = Booking, `4` = CoworkerContract, `5` = Visitor, `6` = CoworkerProduct, `7` = ProposalContract, `8` = CoworkerInvoice, `9` = Teams, `10` = EventAttendees.
</ResponseField>

<ResponseField name="Active" type="boolean">
  Whether this validation rule is currently active.
</ResponseField>

<ResponseField name="Formula" type="string">
  The formula value for this validation rule.
</ResponseField>

<ResponseField name="Description" type="string">
  Free-text description of this validation rule.
</ResponseField>

<ResponseField name="ErrorMessage" type="string">
  The error message value for this validation rule.
</ResponseField>

<ResponseField name="Id" type="integer">
  Unique record identifier.
</ResponseField>

<ResponseField name="UniqueId" type="string">
  UUID of the record.
</ResponseField>

<ResponseField name="CreatedOn" type="string">
  Date and time the record was created (ISO 8601).
</ResponseField>

<ResponseField name="UpdatedOn" type="string">
  Date and time the record was last updated (ISO 8601).
</ResponseField>

<ResponseField name="UpdatedBy" type="string">
  Email of the user who last updated this record.
</ResponseField>

<ResponseField name="IsNew" type="boolean">
  Whether the record was recently created.
</ResponseField>

<ResponseField name="SystemId" type="string">
  External system identifier.
</ResponseField>

```json Example Response theme={null}
{
  "BusinessId": 0,
  "Name": "",
  "RecordType": 0,
  "Active": false,
  "Formula": "",
  "Description": null,
  "ErrorMessage": null,
  "Id": 87654321,
  "UpdatedOn": "2025-01-15T10:30:00Z",
  "CreatedOn": "2025-01-10T08:00:00Z",
  "UniqueId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "UpdatedBy": "admin@example.com",
  "IsNew": false,
  "SystemId": null,
  "ToStringText": "ValidationRule Example",
  "LocalizationDetails": null,
  "CustomFields": null
}
```