Contents

JSONDecoder

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

Declaration

class JSONDecoder

Overview

The example below shows how to decode an instance of a simple GroceryProduct type from a JSON object. The type adopts Codable so that it’s decodable using a JSONDecoder instance.

struct GroceryProduct: Codable {
    var name: String
    var points: Int
    var description: String?
}

let json = """
{
    "name": "Durian",
    "points": 600,
    "description": "A fruit with a distinctive scent."
}
""".data(using: .utf8)!

let decoder = JSONDecoder()
let product = try decoder.decode(GroceryProduct.self, from: json)

print(product.name) // Prints "Durian"

Topics

Creating a Decoder

Decoding

Customizing Decoding

Decoding Dates

Decoding Raw Data

Decoding Exceptional Numbers

Instance Methods

See Also

JSON