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# document(for:)

Returns the document object whose window controller owns a specified window.

```
func document(for window: NSWindow) -> NSDocument?
```

## Parameters

`window`

The window owned by the window controller.

## Return Value

The document object whose window controller owns `window`. Returns `nil` if `window` is `nil`, if `window` has no window controller, or if the window controller does not have an association with an instance of `NSDocument`.

## See Also

[`documentForFileName:`](/documentation/AppKit/NSDocumentController/documentForFileName:)

Returns the document object for the file in which the document data is stored.


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