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# Keyed Archiver Root Object Key

Keys that the archiver uses in the hierarchy of encoded objects.

## Topics

### Constants

[`NSKeyedArchiveRootObjectKey`](/documentation/Foundation/NSKeyedArchiveRootObjectKey)

Archives created using the class method [`archivedData(withRootObject:)`](/documentation/Foundation/NSKeyedArchiver/archivedData(withRootObject:)) use this key for the root object in the hierarchy of encoded objects. The [`NSKeyedUnarchiver`](/documentation/Foundation/NSKeyedUnarchiver) class method [`unarchiveObject(with:)`](/documentation/Foundation/NSKeyedUnarchiver/unarchiveObject(with:)) looks for this root key as well.


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