Decode Type from JSON String

jsondecode.swift

import Foundation

extension Decodable {
	init(_ json: String) throws {
		self = try JSONDecoder().decode(Self.self, from: json.data(using: .utf8)!)
	}
}

struct Thing: Codable {
	let text: String
	let number: Int
}

let json = #"{"text":"this is text","number":12}"#
let thing = try Thing(json)
print(thing)