## Set AI Security for Apps Custom Topics

`client.aiSecurity.customTopics.update(CustomTopicUpdateParamsparams, RequestOptionsoptions?): CustomTopicUpdateResponse`

**put** `/zones/{zone_id}/ai-security/custom-topics`

Set the AI Security for Apps custom topic categories for a zone.

A maximum of 20 custom topics can be configured per zone.
Each topic label must be 2–20 characters using only lowercase letters (a–z), digits (0–9), and hyphens.
Each topic description must be 2–50 printable ASCII characters.

Changes can take up to a minute to propagate to the zone.

### Parameters

- `params: CustomTopicUpdateParams`

  - `zone_id: string`

    Path param: Defines the zone.

  - `topics?: Array<Topic>`

    Body param: Custom topic categories for AI Security for Apps content detection.

    - `label: string`

      Unique label identifier. Must contain only lowercase letters (a–z), digits (0–9), and hyphens.

    - `topic: string`

      Description of the topic category. Must contain only printable ASCII characters.

### Returns

- `CustomTopicUpdateResponse`

  - `topics?: Array<Topic>`

    Custom topic categories for AI Security for Apps content detection.

    - `label: string`

      Unique label identifier. Must contain only lowercase letters (a–z), digits (0–9), and hyphens.

    - `topic: string`

      Description of the topic category. Must contain only printable ASCII characters.

### Example

```node
import Cloudflare from 'cloudflare';

const client = new Cloudflare({
  apiToken: process.env['CLOUDFLARE_API_TOKEN'], // This is the default and can be omitted
});

const customTopic = await client.aiSecurity.customTopics.update({
  zone_id: '023e105f4ecef8ad9ca31a8372d0c353',
});

console.log(customTopic.topics);
```

#### Response

```json
{
  "errors": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "messages": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "result": {
    "topics": [
      {
        "label": "credit-cards",
        "topic": "credit card numbers"
      }
    ]
  },
  "success": true
}
```