# The Template block
The **Template** block enables you to insert variable values into a predefined text document and pass the value on to another block. For example, you could write a form letter and dynamically change placeholder variables for the customer name or sale item in the email.
You can also [insert](/docs/postman-flows/reference/blocks/overview/#insert-data-blocks-into-other-blocks) data blocks into the **Template** block to reference their data in the text or JSON as variables, such as the **String**, **Bool**, **Number**, or **Select** block. The values are injected into the text in placeholder variables surrounded with double curly braces.
## Input
**variable** - When this port receives data, it assigns the data to a variable. You can then reference the variable in the text box with double curly braces like this: `{{variable_name}}`. You can also [insert](/docs/postman-flows/reference/blocks/overview/#insert-data-blocks-into-other-blocks) data blocks here and assign their values to variables.
Variables created in flows aren't available to post-response scripts or other features outside Postman Flows.
**Text box** - Enter text or JSON here. Select **Text** or **JSON** from the dropdown list at the top of the block to specify the input type. Selecting **Text** sends the input as a string from the **Output** port. Selecting **JSON** sends it as formatted JSON, which can be consumed by an **HTTP Request** or **Select** block. With a **Select** block, you can specify a path to retrieve specific data from the JSON.
**Snippets** - Select this dropdown list to add pre-defined text and variables to the **Template** block that you can edit for your use case. Choose from a Markdown document, an HTML email, or an SQL query.
## Output
**Output** - Sends the information entered in the text box. Text input is sent as a string. JSON input is sent as formatted JSON.
## Setup
Enter text in the text box and select the dropdown list at the top of the block to specify the input type. The **Template** block's output port sends text as a string and retains its formatting. It sends JSON as formatted JSON. Reference the **Template** block's variables with curly braces like this: `{{variable_name}}`.
To create a variable in the **Template** block, connect a block's output to the **variable** input port, or insert a block with 
**Add data blocks**. Change an inserted block to a different data block by selecting the inserted block's icon and choosing a block from the dropdown list.
### Use Mustache syntax
The **Template** block supports [Mustache](https://mustache.github.io/mustache.5.html) syntax. You can use Mustache to dynamically format data, iterate over arrays, conditionally display text, and more.
If a referenced variable contains an object, Mustache syntax in the **Template** block returns the full JSON representation of the object, including field names, rather than `[object Object]`.
## Example
To see the **Template** block in an example flow, check out [Flow Snippets: Template](https://www.postman.com/postman/flows-snippets/flow/63bc94e8e308d202595085d7).