Dictionary with json inout

 extension Dictionary {
    init(json: String) {
        self = [:]
        guard let a = (try? JSONSerialization.jsonObject(with: json.dataValue, options: [])) as? Dictionary else { return }
        self = a
    }

    func json() -> String {
        guard let d = try? JSONSerialization.data(withJSONObject: self, options: []) else { return "{}" }
        return String(data: d)
    }

    @discardableResult mutating func loadJSON(path: String) -> Bool {
        guard let d = try? Data(contentsOf: URL(fileURLWithPath: path)),
            let a = (try? JSONSerialization.jsonObject(with: d, options: [])) as? Dictionary else { return false }

        self = a
        return true
    }

    @discardableResult func saveJSON(path: String) -> Bool {
        guard let d = try? JSONSerialization.data(withJSONObject: self, options: []),
            let _ = try? d.write(to: URL(fileURLWithPath: path)) else { return false }
        return true
    }
 }