Swift Dynamic Cast Failed on NSJSONSerialization

3 Solutions Collect From Internet About “Swift Dynamic Cast Failed on NSJSONSerialization”

I usually use this. Works for both numeric and associative types of JSON. It works for your as well. I tried.

func JSONParseArray(jsonString: String) -> [AnyObject] {
if let data = jsonString.dataUsingEncoding(NSUTF8StringEncoding) {
if let array = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions(0), error: nil)  as? [AnyObject] {
    return array
return [AnyObject]()

Your JSON contains root object of type NSArray, not NSDictionary

var jsonResult: NSArray = NSJSONSerialization.JSONObjectWithData(
 options: NSJSONReadingOptions.MutableContainers,
 error: nil)
as NSArray

Refer this..it may help you

this is my json

and i have parsed like this..

Its look like same result..

var err: NSError
        var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
      self.productsArray = jsonResult.valueForKey("products") as NSMutableArray
          println( self.productsArray.count);
        var toInt: Int = self.productsArray.count
        for value in 1...toInt-1


self.valuesArray,self.productsArray are mutable array