JSON Serializer and Converter for URL and String

Serializer.swift

// JSON Serializer helper class
class Serializer {
    
    // Retrieve JSON from Url and tries to parse it
    static func jsonFromUrl(url: String, completionHandler: (NSDictionary) -> (), errorHandler: (NSError?) -> ()) {
        
        let url = NSURL(string: url)
        
        let task = NSURLSession.sharedSession().dataTaskWithURL(url!) {(data, response, error) in
            
            if error != nil {
                errorHandler(error)
            } else {
                let result = NSString(data: data!, encoding: NSUTF8StringEncoding)
                completionHandler(Serializer.jsonFromString(result!))
            }
            
        }
        
        task.resume()
        
        
    }
    
    // Convert JSON string to NSDictionary
    static func jsonFromString(json: NSString) -> NSDictionary {
        
        // convert String to NSData
        let data = json.dataUsingEncoding(NSUTF8StringEncoding)
        var error: NSError?
        
        // convert NSData to 'AnyObject'
        let anyObj: AnyObject?
        
        do {
            
            anyObj = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions(rawValue: 0))
            
        } catch let error1 as NSError {
            
            error = error1
            anyObj = nil
            
        }
        
        if(error != nil) {
            
            print("JSON Error \(error!.localizedDescription)")
            return NSDictionary()
            
        } else {
            
            return anyObj as! NSDictionary
        }
        
    }
    
}

     Serializer.jsonFromUrl(
            URL,
            completionHandler: { data in
                NSLog("\(data)")
            },
            errorHandler: { error in
                NSLog("\(error)")
            }
        )