> ## Documentation Index
> Fetch the complete documentation index at: https://agenticbanking.backbase.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Transformations and generated code

> Preview JOLT and XSLT transformations and download connector artifacts from Connector Studio.

After you approve your endpoint mappings, Connector Studio turns your field-level mappings into transformation files. These files hold the rules that convert a source API payload into the shape the target API expects at runtime.

Connector Studio generates one of two formats:

* REST connectors use JOLT templates, which transform JSON into JSON.
* SOAP connectors use Extensible Stylesheet Language Transformations (XSLT) templates, which transform XML into XML.

Connector Studio generates these files from the mappings you approve. You can then preview them with sample data before you download or deploy them.

## What Connector Studio generates

Connector Studio builds transformations from approved work only:

* The operation mapping must be approved. A draft AI suggestion doesn't produce output.
* The property mappings under that operation must also be approved, for every field you expect in the output.

If a preview or a set of generated code comes back empty, the operations or the properties are usually still in draft.

### Open the generated transform

In the Mapping Workspace, expand **Generated Transform** to see the JOLT or XSLT file for the endpoint and the input or output type you selected.

The panel also reports the **Match confidence** and, where available, the **Round-trip fidelity**. You can edit the JOLT or XSLT content directly in the panel. To keep your edits, select **Save**. To discard unsaved edits, select **Discard**. To restore the version Connector Studio generated from your mappings, select **Revert to original**.

From the panel, you can also **Copy** the file, **Preview** it, or **Download ZIP**. The ZIP contains transformation files only, not connector code.

If you see *No generated transform returned for this operation*, approve the operation and its properties, then return to the panel. The panel reloads whenever the mappings change.

## Preview a transformation

To open the preview, select **Preview** in the **Generated Transform** panel, or **Preview Transformations** on the **Mappings** tab.

The **Transformation Preview** dialog has three columns:

| Column                         | What it holds                                                     | Can you edit it?                |
| :----------------------------- | :---------------------------------------------------------------- | :------------------------------ |
| Sample input                   | The example JSON or XML payload that goes into the transformation | Yes                             |
| JOLT template or XSLT template | The generated transformation specification                        | Yes, so that you can experiment |
| Output                         | The result after the transformation runs                          | No                              |

To run a preview:

<Steps>
  <Step title="Set the sample input">
    Check the sample input. Edit the JSON or XML directly, or select an entry from **Schema examples…** where one is available.

    To build a realistic sample from the source schema, select **Generate Example**. You can add agent instructions, such as a request for locale-specific test data.
  </Step>

  <Step title="Run the transformation">
    Select **Run Transformation**.
  </Step>

  <Step title="Check the output">
    Review the **Output** column. If the result is wrong, correct the mappings in the workspace, then run the preview again.
  </Step>
</Steps>

## Preview and download from the Mappings tab

Under **Approved Mappings** on the **Mappings** tab, you have two actions:

| Action                   | What it does                                                                                                                              |
| :----------------------- | :---------------------------------------------------------------------------------------------------------------------------------------- |
| Preview Transformations  | Generates the transformation files for the approved operations and opens a read-only viewer                                               |
| Download Transformations | Downloads the transformation files as a ZIP archive. The archive contains JOLT or XSLT files only, not connector code or route artifacts. |

If the preview is empty, check the following:

* The parent operation row is approved. Approving individual properties isn't enough.
* For SOAP connectors, the request property mappings are approved. The XSLT generator reads the request side.
* For REST connectors, both the request and the response mappings are approved, if you expect output from both. Each side produces its own output.

## Download the generated code

To see the output for a project, open the **Generated Code** tab on the project overview. The tab holds transformation files, route preview artifacts where available, and metadata. You can **Copy** or **Download** each file.

Until you approve some mappings, the tab shows *No generated code artifacts yet. Approve mappings to generate JOLT or XSLT transformations.*

To download connector artifacts as a ZIP archive, select **Download code** in the project header. This archive is separate from the transformation-only ZIP you get from **Download Transformations** or from **Download ZIP** in the **Generated Transform** panel.

## Related topics

* [Map endpoints and fields](/connector-studio/mapping-workflows)
* [Design routes with Route Builder](/connector-studio/route-builder)
* [Connect from your IDE with MCP](/connector-studio/connect-with-mcp)
* [Overview](/platform/developer-guides/build/overview) in the Build developer guide, for hand-coded connector development on the iPaaS