> For the complete documentation index, see [llms.txt](https://cortex-docs.paloaltonetworks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cortex-docs.paloaltonetworks.com/cortex-xsoar-8-on-prem/8.5/configure-cortex-xsoar/lists/transform-a-list-into-an-array.md).

# Transform a list into an array

Create a transformer to split a list into an array, add or edit a task in a playbook, or map an instance.

1. Go to **Playbooks** and create or edit a playbook.
2. Select **Create Task**.
3. In the **Choose script** field, select the **Set** automation.
4. In the **Key** field, enter the key name.
5. In the **value** field, click **{}**
6. Add a transformer.
   1. Click **Filters And Transformers**.
   2. In the **Get** field, click **{}**.
   3. Expand the **Lists** node and select a list to transform.
   4. In **Apply transformers on the field**, click **Add transformer**.
   5. Search for and select **Split**.
   6. (Optional) In the **delimiter** field, type the delimiter used to separate the items in the string (default is ",").
   7. Click **Save**.
7. Save the task and playbook.

For an example of using a transformer in a list, see [Apply Transformers to Extracted Data](/cortex-xsoar-8-on-prem/8.5/configure-cortex-xsoar/lists/use-cases-json-lists.md#UUID-b6d2eafd-3232-cdd1-dcea-a7fe8ae5e6c1_section-idm4624901952841634196209439753).


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