# decodeTopLevelDecodable(_:forKey:) Decodes a top-level decodable value associated with a given key. ``` @nonobjc func decodeTopLevelDecodable(_ type: T.Type, forKey key: String) throws -> T? where T : Decodable ``` ## Parameters `type` The type of the value to decode. `key` The key in the archive associated with the value to decode. ## Discussion If the archive is not a valid property list, this method throws the error. If a value within the archive fails to decode, this method throws the corresponding error. --- 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)