Crash : Convert dictionary to Json string in Swift 3

json, swift3

Solution

String is not of type AnyObject. Objects are reference types, but String in swift has value semantics. A String however, can be of type Any, so the code below works. I suggest you read up on reference types and value semantic types in Swift; its a subtle but important distinction and its also different from what you expect from most other languages, where String is often a reference type (including objective C).

    let jsonObject: [String: Any] = [
        "firstname": "aaa",
        "lastname": "sss",
        "email": "my_email",
        "nickname": "ddd",
        "password": "123",
        "username": "qqq"
    ]

    do {
        let jsonData = try JSONSerialization.data(withJSONObject: jsonObject, options: .prettyPrinted)
        // here "jsonData" is the dictionary encoded in JSON data

        let decoded = try JSONSerialization.jsonObject(with: jsonData, options: [])
        // here "decoded" is of type `Any`, decoded from JSON data

        // you can now cast it with the right type
        if let dictFromJSON = decoded as? [String:String] {
            print(dictFromJSON)
        }
    } catch {
        print(error.localizedDescription)
    }

Problem

Original source

Related problems

• Convert Dictionary to JSON in Swift