---
title: Classic Advanced Transformations
slug: classic-advanced-transformations
docTags: 
createdAt: 2025-08-11T11:13:45.000Z
---

Need something more complex than basic transformations? Want to write the code yourself?

You can use advanced transformations to write complex JSONata expressions, which gives you significant flexibility to transform data according to your needs. See **[JSONata Docs](https://docs.jsonata.org/overview.html)** to assist you in writing expressions.

- To access advanced mode, complete steps 1-4 on **[Basic Transformations](#)** to open the transformation builder, then click **Switch to advanced** on a block.

:::hint{type="warning"}
Once you click **Switch to advanced**, you cannot revert the block to a basic transformation.
:::

:::hint{type="warning"}
 A confirmation dialog displays **Switching "Block 1" to advanced mode is irreversible. Existing transformations for this block will be converted. Are you sure you would like to continue?** If you want to continue, click **Confirm**.
:::

When might you want to use advanced transformations? Currently, the most common need for advanced data transformations transforming one object structure into a different structure for use within the playbook.

Let's check out an example!

## Transforming One Object Structure to a Different Structure Use Case

Avery wants to take data from a Slack event and restructure the data to Swimlane's common data model. To do that, Avery can use an advanced transformation block to write the JSONata expression.

First, Avery creates a webhook trigger for ingesting Slack events. Now, Avery is ready to add the Transform Data action, switch to advanced mode, and define a new object with the attributes id, type, and timestamp, using playbook values to fill in the values for those attributes.

Watch as Avery creates the advanced transformation.

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Visit the **[JSONata Exerciser](https://try.jsonata.org/)** to verify and/or practice writing JSONata expressions.

:::hint{type="danger"}
 On the advanced mode block, click **Add Playbook Property** to add a playbook property. You cannot manually enter a playbook property.
:::

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