---
title: Flow Variables
description: Configuring Flow Variables
documentId: ipaas-flow-variables
locale: en-US
---

Variables allow for custom flow configuration and environment parameterization, eliminating the need to create a separate integration flow for each environment.

<Callout type="important" title="IMPORTANT">
If your flow has a REST type _trigger_, it will not be possible to use environment variables in the URI.
</Callout>

## Creating a variable

Variables can be created in both the **Diagram** tab and the **Source Code** tab.

In the **Diagram** tab:

![](https://creative-ball-51b3fc85c0.media.strapiapp.com/flow_variables_diagram_e17364c010.png)

<Steps>
<Step>
Click the variables icon ![](https://creative-ball-51b3fc85c0.media.strapiapp.com/environment_variables_button_fea45f4f76.png) on the left side of the canvas.
</Step>
<Step>
Select the environment in which the variable will be applied: _Production_ or _Staging_.
</Step>
<Step>
Register the variable in the form that opens.
</Step>
<Step>
Save the variable by clicking **SAVE**.
</Step>
</Steps>

In the **Source Code** tab, in the folder structure **Source > Flow Variables**:

![](https://creative-ball-51b3fc85c0.media.strapiapp.com/flow_variables_source_code_50b35cb01c.png)

<Steps>
<Step>
Select the environment in which the variable will be applied: _Production_ or _Staging_.
</Step>
<Step>
Register the variable in the form that opens.
</Step>
<Step>
Save the variable by clicking **SAVE**.
</Step>
</Steps>

To register a variable, fill in the following fields: 

* **Variable**: variable name. 
Alphanumeric field. 
The use of `.` and `_` characters is allowed. 
* **Value**: value assigned to the variable, which will be deployed automatically according to the selected environment.

>To apply the variables, enter the variable name in curly braces inside the component, as in the example below: 
>
>* Variable in the HTTPS component:
>
>```
>uri: https://{{variable name}}
>```
>
>In this case, follow the steps below:
>
> * Register the variable by clicking the _flow variables_ icon on the canvas.
>
> * In the HTTPS component form, in the **Common** tab, fill in the **Http Uri** field with the variable name in double curly braces: `{{variable name}}`.

## Variable management

* To add more than one variable, click the **+** button on the right side. 
* To delete a variable, click the trash icon. 
* To hide a variable, click the eye icon. 

<Callout type="important" title="IMPORTANT">
It is not possible to change the variables of a flow with **Deployed** status. 
To modify them, a new deployment will be required.
</Callout>

## Locked variables

The variables listed below are reserved for internal use and cannot be used:

```
AWS_ACCESS_KEY_ID
AWS_SECRET_ACCESS_KEY
AWS_REGION
AWS_DEFAULT_REGION
RESOURCES_DIR
CAMEL_* (any variable starting with CAMEL_)
```

## Examples

The example below references the variable "name".
When executing this integration, the variable will be replaced by the registered name.

```yaml
- from:
    uri: rest:get:/hello
    steps:
    - log:
          message: Hello {{name}}
```

![](https://creative-ball-51b3fc85c0.media.strapiapp.com/flow_variables_hello_b6e3c71c6a.gif)

In this other example, we reference a variable in a URL.

```yaml
- to:
    id: to-generic
    uri: https://{{url}}
    parameters:
      httpMethod: POST
```

![](https://creative-ball-51b3fc85c0.media.strapiapp.com/flow_variables_url_b829222de0.gif)