How do I use custom keys with Swift 4's Decodable protocol?

Question

Swift 4 introduced support for native JSON encoding and decoding via the Decodable protocol. How do I use custom keys for this?

E.g., say I have a struct

<         


        

Answer 1

By using CodingKey you can use custom keys in codable or decodable protocol.

struct person: Codable {
    var name: String
    var age: Int
    var street: String
    var state: String

    private enum CodingKeys: String, CodingKey {
        case name
        case age
        case street = "Street_name"
        case state
    } }