> ## Documentation Index
> Fetch the complete documentation index at: https://docs-dev-fix-docs-5546-update-db-search.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.
> Learn how to configure your logic flow actions to add if/then conditions, store shared variables, show error messages or map values.
# Logic
This list of logic actions allows you to add form conditional logic, store shared variables, map values, and to display custom error messages.
## If/then condition
Adds a conditional action with True / False branches to customize the behavior of the flow based on input or properties.
### Input settings
| Parameter | Description |
| --------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Condition | Customizable conditional action that triggers `True` / `False` branches depending on its result. You can use the `AND` / `OR` operators to nest different conditions. |
### Output object
| Property | Type | Description |
| -------- | ------- | ------------------------------------------------------------------- |
| `result` | Boolean | Returns a `true` or `false` response based on the condition result. |
### Output object example
```json lines theme={null}
{
"result": true
}
```
## Store shared variable
Stores variables in a private state that is available in your form and across its flows.
You can reference these shared variables using `{{vars.*}}`**.** To learn more, read [Variables](/docs/customize/forms/variables).
### Input settings
| Parameter | Description |
| ----------- | ----------------------------------------------------------------------------------------------------------------------------- |
| Data fields | The variables to be stored in a private state for use in your form and across its flow. Use key/value pairs to add variables. |
## Show error message
Displays a custom error message to the user.
This flow action terminates the Flow. Any actions inserted after it won't be executed.
### Input settings
| Parameter | Description |
| ------------- | ---------------------------------------------- |
| Error message | The error message to be displayed to the user. |
## Input value mapping
Maps an input variable to an output based on its values.
### Input settings
| Parameter | Description |
| ---------------------- | ---------------------------------------------------------------------------------------- |
| Input value (required) | The input variable. |
| Mapping table | Map an input variable value an output. |
| Default output value | Sets a default output value to be used when no output value is set in the mapping table. |
### Output object
| Property | Type | Description |
| -------- | ------ | ------------------------------------- |
| `result` | String | Returns the value mapped to an input. |
### Output object example
```json lines theme={null}
{
"result": "Please enter a valid email address."
}
```