# ExtensionExists()

Checks if a certain extension exists or not.

```
ExtensionExists( id=string, version=string );
```

**Returns:** boolean

# Arguments

| Argument | Type | Required | Description | Default |
|----------|------|----------|-------------|---------|
| id | string | Yes | Id of the Extension (UUID) |  |
| version | string | No | Version of the Extension. |  |

# Examples

```cfml

dump(extensionExists("37C61C0A-5D7E-4256-8572639BE0CF5838")); // ESAPI

```







# Categories

[Extensions](../../categories/extensions.md), [Lucee Server related Tags, Functions and Guides](../../categories/server.md)

# See Also

[ExtensionList()](extensionlist.md)