Utility to easily serialise Struct in Swift

JSONSerializable.swift

//: ### Defining the protocols
protocol JSONRepresentable {
    var JSONRepresentation: Any { get }
}

protocol JSONSerializable: JSONRepresentable {}

//: ### Implementing the functionality through protocol extensions
extension JSONSerializable {
    var JSONRepresentation: Any {
        var representation = [String: Any]()

        for case let (label?, value) in Mirror(reflecting: self).children {

            switch value {

            case let value as Dictionary<String, Any>:
                representation[label] = value as AnyObject

            case let value as Array<Any>:
                if let val = value as? [JSONSerializable] {
                    representation[label] = val.map({ $0.JSONRepresentation as AnyObject }) as AnyObject
                } else {
                    representation[label] = value as AnyObject
                }

            case let value:
                representation[label] = value as AnyObject

            default:
                // Ignore any unserializable properties
                break
            }
        }
        return representation as Any
    }
}

extension JSONSerializable {
    func toJSON() -> String? {
        let representation = JSONRepresentation

        guard JSONSerialization.isValidJSONObject(representation) else {
            print("Invalid JSON Representation")
            return nil
        }

        do {
            let data = try JSONSerialization.data(withJSONObject: representation, options: [])

            return String(data: data, encoding: .utf8)
        } catch {
            return nil
        }
    }
}

//: ### Define the Structures
//: Notice how they are conforming to the `JSONSerializable` protocol
//struct Author: JSONSerializable {
//    var name: String
//}
//struct Book: JSONSerializable {
//    var title: String
//    var isbn: String
//    var pages: Int
//
//    var authors:[JSONSerializable]
//    var extra:[String: Any]
//}
//
////: ### Create a sample object for serialization
//let book = Book(
//    title: "Mirage",
//    isbn: "0399158081",
//    pages: 397,
//    authors: [
//        Author(name: "Clive Cussler"),
//        Author(name:"Jack Du Brul")
//    ],
//    extra: [
//        "foo": "bar",
//        "baz": 142.226
//    ]
//)
//
//
////: ### Use the protocols to convert the data to JSON
//if let json = book.toJSON() {
//    print(json)
//}
//
//