# Transform Preview

When developing your [Transformer](https://olddocs.exivity.io/3.4.3/data-pipelines/transform/..#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](https://3540922554-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LHEKskLK6aXinV75Knl%2F-Lyn6yTm-dqPibhdLL1n%2F-Lyn8iJw9Gg0lTwU-Dht%2Fimage.png?alt=media\&token=0c3cd9d8-cae3-4bae-8384-1d1d0120cd74)

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:

![](https://3540922554-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LHEKskLK6aXinV75Knl%2F-Lyn6yTm-dqPibhdLL1n%2F-Lyn9zk65dq3WrpXTDWg%2Fimage.png?alt=media\&token=f18b8a08-73c7-49fe-b854-cbc4d5186456)

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

![](https://3540922554-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LHEKskLK6aXinV75Knl%2F-Lyn6yTm-dqPibhdLL1n%2F-LynA4x4p89F0YLpTuAG%2Fimage.png?alt=media\&token=e22469c0-3726-4b15-99c6-bf2b2140ecc4)

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