@noppe @swift-4.2.4
import Foundation let json = """ [{ "id": 0, "mode": "high" }, { "id": 1, "mode": "middle" }, { "id": 2, "mode": "moddle" }, { "id": 3, "mode": "low" } ] """ enum Mode: String, Decodable { case high case middle case low } struct Object: Decodable { let id: Int let mode: Mode init(id: Int, mode: Mode) { self.id = id self.mode = mode } } struct FailableBox<T> : Decodable where T : Decodable { init(from decoder: Decoder) throws { self.value = try? T.init(from: decoder) } var value: T? } let objects: [Object] = try! JSONDecoder() .decode([FailableBox<Object>].self, from: json.data(using: .utf8)!) .compactMap { $0.value } print(objects)