How to convert a JSON string to a dictionary?

Question

I want to make one function in my swift project that converts String to Dictionary json format but I got one error:

Cannot convert expression\'s type

Answer 1

let JSONData = jsonString.data(using: .utf8)!

let jsonResult = try JSONSerialization.jsonObject(with: data, options: .mutableLeaves)

guard let userDictionary = jsonResult as? Dictionary else {
            throw NSError()}