> For the complete documentation index, see [llms.txt](https://olddocs.exivity.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://olddocs.exivity.io/3.4.3/data-pipelines/transform/transform-preview.md).

# Transform Preview

When developing your [Transformer](/3.4.3/data-pipelines/transform.md#overview), it is possible to view intermediate results by utilizing the preview functionality in the **Transformer** editor. To use the **Transformer Preview**, place your cursor at a line number in your script uptill where the Transformer should execute. In the example below, the cursor is placed at line numer 27:

![Transformer Preview](/files/-Lyn8iJw9Gg0lTwU-Dht)

Make sure to select a **Preview Date** for which data is available in the system. Then execute the preview by clicking the **Update and Preview** button.

By default, the preview will load the first 1000 records for each **DSET** being imported. In case you want to increase / decrease this amount, you can do so by adjusting the value in the **Output Limit** field:

![](/files/-Lyn9zk65dq3WrpXTDWg)

Additionally, the preview will by default return the contents of the **Default** [**DSET**](/3.4.3/advanced/digging-deeper/dataset-lifecycle.md#dsets). In case you prefer to preview a static **DSET**, you can control this by selecting a custom **DSET** from the drop down selector:

![](/files/-LynA4x4p89F0YLpTuAG)

{% hint style="info" %}
When executing a Transformer in **Preview** mode, it will **not** write any daily [RDF files](/3.4.3/advanced/digging-deeper/databases.md#daily-rdfs) to disk, nor will it populate any [services](/3.4.3/getting-started/introduction/services-introduction.md#an-introduction-to-services).
{% endhint %}