Some thoughts about Swift Codable

Codable.swift

public extension Decodable {
    static func toModel(_ value: [String: Any], using decoder: JSONDecoder = JSONDecoder()) throws -> Self {
        let data = try JSONSerialization.data(withJSONObject: value, options: JSONSerialization.WritingOptions.init(rawValue: 0))
        return try toModel(data, using: decoder)
    }
    static func toModel(_ value: [[String: Any]], using decoder: JSONDecoder = JSONDecoder()) throws -> [Self] {
        let data = try JSONSerialization.data(withJSONObject: value, options: JSONSerialization.WritingOptions.init(rawValue: 0))
        return try toModel(data, using: decoder)
    }

    static func toModel(_ value: Data, using decoder: JSONDecoder = JSONDecoder()) throws -> Self {
        return try decoder.decode(Self.self, from: value)
    }
    static func toModel(_ value: Data, using decoder: JSONDecoder = JSONDecoder()) throws -> [Self] {
        return try decoder.decode([Self].self, from: value)
    }
}

public extension Encodable {
    /// must to use correct type
    func toJSON() throws -> [String: Any] {
        let data = try JSONEncoder().encode(self)
        return try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.allowFragments) as? [String: Any] ?? [:]
    }
    /// must to use correct type
    func toJSONString() throws -> String {
        let data = try JSONEncoder().encode(self)
        return String.init(data: data, encoding: String.Encoding.utf8) ?? ""
    }
}
public extension Encodable where Self: Sequence {
    /// must to use correct type
    func toJSON() throws -> [[String: Any]]? {
        let data = try JSONEncoder().encode(self)
        return try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.allowFragments) as? [[String: Any]] ?? []
    }
}