# The Collect block

<img alt="The Collect block" src="https://assets.postman.com/postman-docs/v11/flows-reference-blocks-collect-v11.53.2.jpg" width="280px" />

The **Collect** block receives individual data items from iterations of a [loop](/docs/postman-flows/build-flows/structure/loops/overview/), then aggregates them into a list, formatted as a JSON array like this: `["item1","item2","item3"]`. For example, if a loop sends one HTTP request per iteration, the **Collect** block can gather all the responses into a single list when the loop completes. The **Collect** block is commonly used with the [**For**](/docs/postman-flows/reference/blocks/for/) block, which sends each item in a list individually, and the [**Repeat**](/docs/postman-flows/reference/blocks/repeat/) block, which runs a group of blocks multiple times.

## Input

**Item** - Accepts a single data item from a [**For**](/docs/postman-flows/reference/blocks/for/) or [**Repeat**](/docs/postman-flows/reference/blocks/repeat/) loop.

## Outputs

**List** - Creates a JSON array of all the items sent to this block when the loop is complete.

**Finish** - Sends an event when the loop is complete and the **Collect** block has aggregated the data into an array.

## Example

To see the **Collect** block in an example flow, check out [Flow Snippets: Collect](https://www.postman.com/postman/flows-snippets/flow/63b898822e67b05a8333e16c).

## Related blocks

* [**For**](/docs/postman-flows/reference/blocks/for/)
* [**Repeat**](/docs/postman-flows/reference/blocks/repeat/)

## Related pages

For more information about creating loops in Flows and tutorials that use the **Collect** block, see the following:

* [Loops overview](/docs/postman-flows/build-flows/structure/loops/overview/)
* [Create a count-based loop with the Repeat block](/docs/postman-flows/tutorials/beginner/create-count-based-loop/)
* [Create a dashboard using Postman Flows](/docs/postman-flows/tutorials/advanced/create-a-dashboard-in-flows/)
* [Create a list-based loop with the For block](/docs/postman-flows/tutorials/beginner/create-list-based-loop/)