# decodeNil(forKey:) Decodes a null value for the given key. ``` func decodeNil(forKey key: KeyedDecodingContainer.Key) throws -> Bool ``` ## Parameters `key` The key that the decoded value is associated with. ## Return Value Whether the encountered value was null. ## Discussion> throws: `DecodingError.keyNotFound` if `self` does not have an entry > for the given key. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)