Package - harrytwright/CodableCollection


Codable is a selection of code snippets to allow Dictionary and Array to work better with Swift 4's Codable

Limitations With Swift.Codable

Let say your Codable struct or class looks like this:

struct User: Codable {
    var name: String
    var email: String
    var metadata: [String: Any]

You will be hit with "cannot automatically synthesize 'Decodable' because '[String : Any]' does not conform to 'Decodable'", this is because the complier cannot know what the Any object will be, it could be something that does not conform to Codable.

With CodableCollection all you need to do is:

enum MetadataKeys: String, CodingKey {
    case timestamp
    case locale

struct User: Codable {
    var name: String
    var email: String
    var metadata: CodableDictionary<MetadataKeys, AnyCodable>

Compiling this and passing JSON through works

let data = """
  "metadata": {
    "timestamp": \(Date().timeIntervalSince1970)
""".data(using: .utf8)!

let aUser = try! JSONDecoder().decode(User.self, from: data)

// ▿ __lldb_expr_18.User
// - name: "harry"
// - email: ""
// ▿ metadata: ["timestamp": AnyCodable(1510158557.90589)]
//   ▿ _dictionary: 1 key/value pair
//     ▿ (2 elements)
//       - key: __lldb_expr_18.MetadataKeys.timestamp
//       ▿ value: AnyCodable(1510158557.90589)
//         - value: 1510158557.90589


  • iOS
  • Xcode 9.0+
  • Swift 4.0


NOTE: Currently we only support Swift Package Manager

Swift Package Manager

The Swift Package Manager is a tool for automating the distribution of Swift code and is integrated into the swift compiler.

Once you have your Swift package set up, adding Codable as a dependency is as easy as adding it to the dependencies value of your Package.swift.

dependencies: [
    .package(url: "", from: "0.2.0")


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0.2.0 - Nov 9, 2017