---
title: Preview transformer
---

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[API Reference](https://developers.cloudflare.com/api/go)

[Logpush](https://developers.cloudflare.com/api/go/resources/logpush)

[Transformers](https://developers.cloudflare.com/api/go/resources/logpush/subresources/transformers)

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# Preview transformer

client.Logpush.Transformers.Preview(ctx, params) (\*SinglePage\[[TransformerPreviewResponse](<https://developers.cloudflare.com/api/go/resources/logpush#(resource)%20logpush.transformers%20%3E%20(model)%20TransformerPreviewResponse%20%3E%20(schema)>)], error)

POST/accounts/{account\_id}/logpush/transformers/preview

Executes a SQL transformer against a single input record and returns the transformed output. This is a stateless endpoint — nothing is persisted.

##### Security

<details>

<summary>API Token</summary>



The preferred authorization scheme for interacting with the Cloudflare API. <a href="https://developers.cloudflare.com/fundamentals/api/get-started/create-token/">Create a token</a>.

**Example:**<code>Authorization: Bearer Sn3lZJTBX6kkg7OdcBUAxOO963GEIyGQqnFTOFYY</code>

</details>

<details>

<summary>API Email + API Key</summary>



The previous authorization scheme for interacting with the Cloudflare API, used in conjunction with a Global API key.

**Example:**<code>X-Auth-Email: user@example.com</code>

The previous authorization scheme for interacting with the Cloudflare API. When possible, use API tokens instead of Global API keys.

**Example:**<code>X-Auth-Key: 144c9defac04969c7bfad8efaa8ea194</code>

</details>

##### Accepted Permissions (at least one required)

`Logs Write`

##### ParametersExpand Collapse

<details>

<summary>

params TransformerPreviewParams

</summary>

AccountID param.Field\[string]

Path param: Identifier.

maxLength32

<a href="#(resource)%20logpush.transformers%20%3E%20(method)%20preview%20%3E%20(params)%20default%20%3E%20(param)%20account_id">Link to this property</a>

Input param.Field\[map\[string, unknown]]

Body param: A single log record to transform (JSON object).

<a href="#(resource)%20logpush.transformers%20%3E%20(method)%20preview%20%3E%20(params)%20default%20%3E%20(param)%20input">Link to this property</a>

Sql param.Field\[string]

Body param: The SQL transformer query. Maximum 32 KB. The query must contain a FROM clause referencing a valid logpush dataset.

maxLength32768

<a href="#(resource)%20logpush.transformers%20%3E%20(method)%20preview%20%3E%20(params)%20default%20%3E%20(param)%20sql">Link to this property</a>

</details>

[Link to this property](<#(resource)%20logpush.transformers%20%3E%20(method)%20preview%20%3E%20(params)%20default>)

##### ReturnsExpand Collapse

type TransformerPreviewResponse map\[string, unknown]

[Link to this property](<#(resource)%20logpush.transformers%20%3E%20(model)%20TransformerPreviewResponse%20%3E%20(schema)>)

### Preview transformer

Go

HTTPTypeScriptPythonGoTerraform

```
package main

import (
  "context"
  "fmt"

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

func main() {
  client := cloudflare.NewClient(
    option.WithAPIToken("Sn3lZJTBX6kkg7OdcBUAxOO963GEIyGQqnFTOFYY"),
  )
  page, err := client.Logpush.Transformers.Preview(context.TODO(), logpush.TransformerPreviewParams{
    AccountID: cloudflare.F("023e105f4ecef8ad9ca31a8372d0c353"),
    Input: cloudflare.F(map[string]interface{}{
    "ClientIP": "bar",
    "ClientRequestHost": "bar",
    "EdgeStartTimestamp": "bar",
    "RayID": "bar",
    }),
    Sql: cloudflare.F("SELECT ClientIP, RayID FROM http_requests"),
  })
  if err != nil {
    panic(err.Error())
  }
  fmt.Printf("%+v\n", page)
}
```

200 example

```
{
  "errors": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "messages": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "success": true,
  "result": [
    {
      "ClientIP": "bar",
      "RayID": "bar"
    }
  ]
}
```

##### Returns Examples

200 example

```
{
  "errors": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "messages": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "success": true,
  "result": [
    {
      "ClientIP": "bar",
      "RayID": "bar"
    }
  ]
}
```