## Update a filter

`client.Filters.Update(ctx, filterID, params) (*FirewallFilter, error)`

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

Updates an existing filter.

### Parameters

- `filterID string`

  The unique identifier of the filter.

- `params FilterUpdateParams`

  - `ZoneID param.Field[string]`

    Path param: Defines an identifier.

  - `FirewallFilter param.Field[FirewallFilter]`

    Body param

### Returns

- `type FirewallFilter struct{…}`

  - `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 bool`

    When true, indicates that the filter is currently paused.

  - `Ref string`

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

### Example

```go
package main

import (
  "context"
  "fmt"

  "github.com/cloudflare/cloudflare-go"
  "github.com/cloudflare/cloudflare-go/filters"
  "github.com/cloudflare/cloudflare-go/option"
)

func main() {
  client := cloudflare.NewClient(
    option.WithAPIToken("Sn3lZJTBX6kkg7OdcBUAxOO963GEIyGQqnFTOFYY"),
  )
  firewallFilter, err := client.Filters.Update(
    context.TODO(),
    "372e67954025e0ba6aaa6d586b9e0b61",
    filters.FilterUpdateParams{
      ZoneID: cloudflare.F("023e105f4ecef8ad9ca31a8372d0c353"),
      FirewallFilter: filters.FirewallFilterParam{

      },
    },
  )
  if err != nil {
    panic(err.Error())
  }
  fmt.Printf("%+v\n", 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
}
```