> ## Documentation Index
> Fetch the complete documentation index at: https://terminal49-vorflux-dev-12120-supported-document-types.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Update container custom field

> Update an existing custom field value on a container in the Terminal49 API, identified by the custom field definition's api_slug for that container.

Updates a specific custom field on a container by its `api_slug`.

## Path parameters

| Parameter      | Required | Description                                  |
| -------------- | -------- | -------------------------------------------- |
| `container_id` | Yes      | The ID of the container                      |
| `api_slug`     | Yes      | The api\_slug of the custom field definition |

## Request body

| Parameter | Required | Description          |
| --------- | -------- | -------------------- |
| `value`   | Yes      | The new value to set |

## Authorization

Requires `update` permission on the container.

## Response

Returns `200 OK` with the updated custom field resource on success.