Pretty print extension for Alamofire Request

AlamofirePrintable.swift

extension Alamofire.Request {
    func responseDebugPrint() -> Self {
        return responseJSON() {
            response in
            if let  JSON: AnyObject = response.result.value,
                    JSONData = try? NSJSONSerialization.dataWithJSONObject(JSON, options: .PrettyPrinted),
                    prettyString = NSString(data: JSONData, encoding: NSUTF8StringEncoding) {
             print(prettyString)
            } else if let error = response.result.error {
                print("Error Debug Print: \(error.localizedDescription)")
            }
        }
    }
}

@smaljaar How to use it?