> For the complete documentation index, see [llms.txt](https://docs.stackai.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.stackai.com/workflow-builder/utils-logic-and-others/logic/loop-subflow.md).

# Loop Subflow

{% @arcade/embed flowId="mhXFVGpx8Bi2MMBxhSDV" url="<https://app.arcade.software/share/mhXFVGpx8Bi2MMBxhSDV>" %}

The Loop Subflow Node allows you to run a branch of your project in a loop over a list of inputs. To set up the node, make sure you are inputting a list of any form.

This node provides two execution branches:

* **Loop**\
  This branch runs once for each item in the input list. During each iteration, the current item is available via the `current_item` variable. **Important:** If you want to collect results across all iterations, you must attach an output node at the end of the Loop branch. Only outputs explicitly emitted there will be aggregated.
* **Done**\
  This branch executes after all items have been processed by the Loop branch. If outputs were emitted during the Loop branch, they will be aggregated and made available here.

### **Common Pitfalls**

* **List passed as a string**\
  If the entire list appears inside `current_item` instead of a single element, the input may have been parsed as a string rather than a list.

  **Example:**

  * Incorrect: `"[item_1, item_2, item_3]"` (string)
  * Correct: `[item_1, item_2, item_3]` (list)

  Ensure the input is a properly structured list so each item is processed individually.


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