# encode(_:) Returns a JSON-encoded representation of the value you supply. ``` func encode(_ value: T) throws -> Data where T : Encodable ``` ## Parameters `value` The value to encode as JSON. ## Return Value The encoded JSON data. ## Discussion If there’s a problem encoding the value you supply, this method throws an error based on the type of problem: - The value fails to encode, or contains a nested value that fails to encode—this method throws the corresponding error. - The value isn’t encodable as a JSON array or JSON object—this method throws the error. - The value contains an exceptional floating-point number (such as or ) and you’re using the default [`JSONEncoder.NonConformingFloatEncodingStrategy`](/documentation/Foundation/JSONEncoder/NonConformingFloatEncodingStrategy-swift.enum) — this method throws the 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)