## Update a filter

`client.filters.update(stringfilterId, FilterUpdateParamsparams, RequestOptionsoptions?): FirewallFilter`

**put** `/zones/{zone_id}/filters/{filter_id}`

Updates an existing filter.

### Parameters

- `filterId: string`

  The unique identifier of the filter.

- `params: FilterUpdateParams`

  - `zone_id: string`

    Path param: Defines an identifier.

  - `description?: string`

    Body param: An informative summary of the filter.

  - `expression?: string`

    Body param: The filter expression. For more information, refer to [Expressions](https://developers.cloudflare.com/ruleset-engine/rules-language/expressions/).

  - `paused?: boolean`

    Body param: When true, indicates that the filter is currently paused.

  - `ref?: string`

    Body param: A short reference tag. Allows you to select related filters.

### Returns

- `FirewallFilter`

  - `id?: string`

    The unique identifier of the filter.

  - `description?: string`

    An informative summary of the filter.

  - `expression?: string`

    The filter expression. For more information, refer to [Expressions](https://developers.cloudflare.com/ruleset-engine/rules-language/expressions/).

  - `paused?: boolean`

    When true, indicates that the filter is currently paused.

  - `ref?: string`

    A short reference tag. Allows you to select related filters.

### 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 firewallFilter = await client.filters.update('372e67954025e0ba6aaa6d586b9e0b61', {
  zone_id: '023e105f4ecef8ad9ca31a8372d0c353',
});

console.log(firewallFilter.id);
```

#### 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": {
    "id": "372e67954025e0ba6aaa6d586b9e0b61",
    "description": "Restrict access from these browsers on this address range.",
    "expression": "(http.request.uri.path ~ \".*wp-login.php\" or http.request.uri.path ~ \".*xmlrpc.php\") and ip.addr ne 172.16.22.155",
    "paused": false,
    "ref": "FIL-100"
  },
  "success": true
}
```