Class

JSONDecoder

iOS 8.0+ iPadOS 8.0+ Mac Catalyst 8.0+ macOS 10.10+ tvOS 9.0+ watchOS 2.0+

An object that decodes instances of a data type from JSON objects.

class JSONDecoder

Topics

init()
Creates a new, reusable JSON decoder with the default formatting settings and decoding strategies.

var allowsJSON5: Bool
Specifies that decoding supports the JSON5 syntax.
var assumesTopLevelDictionary: Bool
Specifies that decoding assumes the top level of the JSON data is a dictionary, even if it doesn’t begin and end with braces.
var dataDecodingStrategy: JSONDecoder.DataDecodingStrategy
The strategy that a decoder uses to decode raw data.
var dateDecodingStrategy: JSONDecoder.DateDecodingStrategy
The strategy used when decoding dates from part of a JSON object.
var keyDecodingStrategy: JSONDecoder.KeyDecodingStrategy
A value that determines how to decode a type’s coding keys from JSON keys.
var nonConformingFloatDecodingStrategy: JSONDecoder.NonConformingFloatDecodingStrategy
The strategy used by a decoder when it encounters exceptional floating-point values.
var userInfo: [CodingUserInfoKey : any Sendable]
A dictionary you use to customize the decoding process by providing contextual information.

enum DataDecodingStrategy
The strategies for decoding raw data.
enum DateDecodingStrategy
The strategies available for formatting dates when decoding them from JSON.
enum KeyDecodingStrategy
The values that determine how to decode a type’s coding keys from JSON keys.
enum NonConformingFloatDecodingStrategy
The strategies for encoding nonconforming floating-point numbers, also known as IEEE 754 exceptional values.