Deserialize JSON from String to object - ios

Question

I try to deseralize my JSON that look like this :
{
"access_token": "This_is_my_token"
"item01": "blabla"
"item02": "blabla"
...
}
and I want to save only access_token into a variable. Not a big deal.
For exemple, with PHP it is something really simple like:
<?php
$jsonObj = json_decode($jsonString);
$access_token = $jsonObj["access_token"];
?>
But it doesn't look this easy with Swift. I try many things but nothing works for me.
Here is the code I have:
dataString = String(data: data, encoding: .utf8)!
do {
let anyObj: AnyObject? = try JSONSerialization.jsonObject(with: dataString, options: JSONSerialization.ReadingOptions([])) as AnyObject
guard let access_token = anyObj?.firstItem as? [String: AnyObject]
else {return}
print(access_token)
} catch {
print("JSON Deserial. Error")
}
with this code, I can't manipulate anyObj like I do with $jsonObj in PHP, there is no way to do something like anyObj["access_token"]
How can I access to this item in the object ?
Thanks

Answer 1

You can simply call this function by passing your data here and it will return a dictionary. From that dictionary you can pick access_token value.
class func parseJsonToDictionary(data: Data) -> ([String:AnyObject]?,Error?) {
let _ = NSString(data: data, encoding:String.Encoding.utf8.rawValue)
do {
let JSONObject = try JSONSerialization.jsonObject(with: data, options: .allowFragments)
return (JSONObject as? [String:AnyObject],nil)
} catch let error as NSError {
return (nil,error)
}
}

Answer 2

If you are having json string and not json data then you can use this method to convert it to dictionary.
func convertToDictionary(text: String) -> [String: Any]? {
if let data = text.data(using: .utf8) {
do {
return try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any]
} catch {
print(error.localizedDescription)
}
}
return nil
}
let str = "{\"name\":\"James\"}"
let dict = convertToDictionary(text: str)
Later you can get value of access_token from dictionary.

Answer 3

Instead of casting anyObj to AnyObject try casting it to a dictionary of strings like
let anyObj: AnyObject? = try JSONSerialization.jsonObject(with: dataString, options: JSONSerialization.ReadingOptions([])) as [String:String]
Then you can get accessToken by using anyObj["access_token"]