# The Bool block

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

The **Bool** block sends a true or false value from its output port. This can be useful when you want to control your flow based on a condition. For example, you could send the **Bool** block's output to an [**If**](/docs/postman-flows/reference/blocks/if/) block. The **If** block could then route incoming data to one of two other blocks, depending on whether the **Bool** block's value is true or false.

## Output

**True** or **False** - Sends a true or false value, depending on the state of the **True/False** toggle.

## Setup

Click the toggle to set the block's output to true or false.

You can [insert](/docs/postman-flows/reference/blocks/overview/#insert-data-blocks-into-other-blocks) the **Bool** block into certain blocks instead of connecting it to them. For a list of blocks you can insert the **Bool** block into, see [Related blocks](#related-blocks).

## Example

To see the **Bool** block in an example flow, check out [Flow Snippets: Bool](https://www.postman.com/postman/flows-snippets/flow/63b8b16f2b292a29393dbef9).

## Related blocks

You can insert the **Bool** block into the following blocks:

* [**AI Agent**](/docs/postman-flows/reference/blocks/ai-agent/)
* [**Condition**](/docs/postman-flows/reference/blocks/condition/)
* [**Create with AI**](/docs/postman-flows/reference/blocks/create-with-ai/)
* [**Evaluate**](/docs/postman-flows/reference/blocks/evaluate/)
* [**Flow**](/docs/postman-flows/reference/blocks/flow-module/)
* [**HTTP Request**](/docs/postman-flows/reference/blocks/http-request/)
* [**If**](/docs/postman-flows/reference/blocks/if/)
* [**List**](/docs/postman-flows/reference/blocks/list/)
* [**Output**](/docs/postman-flows/reference/blocks/output-module/)
* [**Record**](/docs/postman-flows/reference/blocks/record/)
* [**Template**](/docs/postman-flows/reference/blocks/template/)