Convert an array of objects to JsonArray in Swift3

Question

I have my DataModel as this and it has a function name toJSON which converts this object to string representation of JSON

ContactEntry: NSObject {
    var name: String!
    var phone: String?
    var email: String?

    func toJson() -> String {
    var dict : [String: AnyObject] = [:]
    dict["name"] = (self.name ??  "") as AnyObject
    dict["phone"] = (self.phone ?? "") as AnyObject
    dict["email"] = (self.email ?? "") as AnyObject


    guard let data = try? JSONSerialization.data(withJSONObject: dict, options: []) else{
        return "{}"
    }

    guard let jsonString = String(data: data, encoding: String.Encoding.utf8) else {
        return "{}"
    }
    return jsonString
}
}

It works very fine until now as I am getting correct JSON representation for this object.

Now I have to convert an array of ContactEntry to JsonArray.

I am doing this way but I am getting very weird symbols in the result string. Let's say

var contacts = [ContactEntry]()
var contactsStr = [String]()
...
for contact in contacts{
    contactsStr.append(contact.toJson())
}

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

    let jsonString = try? String(data: data!, encoding: String.Encoding.utf8)

    print(jsonString)
}

I am getting the output like this

[\n \"{\\\"phone\\\":\\\"+XXXX\\\",\\\"name\\\":\\\"YYYY\\\",\\\"email\\\":\\\"\\\"},\",\n \".........\n]

Please help me to do it in a better and clean way

Thanks for your help

Forget prettyPrinted, that causes most of the weird output — vadian
– vadian, Commented Nov 13, 2016 at 21:14
@Frankie This is how contactStr looks ["{\"phone\":\"+xxx\",\"name\":\"yyy\",\"email\":\"\"}", "{\"phone\":\"+xxx\",\"name\":\"yy\",\"email\":\"\"}", "{\"phone\":\"xxx\",\"name\":\"yyy\",\"email\":\"\"}", "{\"phone\":\"+yyy\",\"name\":\"xxxx\",\"email\":\"\"}", "{\"phone\"... — user2873720
– user2873720, Commented Nov 13, 2016 at 21:36
@vadian Is this the best way to convert to JSON? I don't have much of an experience in Swift but I am sure JSON serialisation and deserialisation is very common in Swift. Just wanted to know right practice — user2873720
– user2873720, Commented Nov 13, 2016 at 21:37

Frankie · Accepted Answer · 2016-11-13 22:38:48Z

1

I think you are double serializing your output. That's why I asked for the contact string.

Try:

func toJson() -> [String: AnyObject] {
    var dict : [String: AnyObject] = [:]
    dict["name"] = (self.name ??  "") as AnyObject
    dict["phone"] = (self.phone ?? "") as AnyObject
    dict["email"] = (self.email ?? "") as AnyObject
    return dict
}

With:

var contactsStr = [[String: AnyObject]]()

And print out the serialization. It should just be singly escaping quotes such as \"name\". Not \\"name\\"

answered Nov 13, 2016 at 22:38

Frankie

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