Json+Codable.swift

import Foundation

extension JSONDecoder {
    static func decodeFromString<T: Decodable>(_ type: T.Type, from: String) -> T? {
        guard let data = from.data(using: .utf8) else { return nil }
        return try? JSONDecoder().decode(type, from: data)
    }
}

extension JSONEncoder {
    static func encodeToString<T: Encodable>(value: T) -> String? {
        guard let data = try? JSONEncoder().encode(value) else { return nil }
        return String(data: data, encoding: .utf8)
    }
}