Converting JSON to NSData, and NSData to JSON in Swift

Here is code to convert between JSON and NSData in swift 2.0 (adapted from Shuo's answer)

// Convert from NSData to json objectfunc nsdataToJSON(data: NSData) -> AnyObject? {    do {        return try NSJSONSerialization.JSONObjectWithData(data, options: .MutableContainers)    } catch let myJSONError {        print(myJSONError)    }    return nil}// Convert from JSON to nsdatafunc jsonToNSData(json: AnyObject) -> NSData?{    do {        return try NSJSONSerialization.dataWithJSONObject(json, options: NSJSONWritingOptions.PrettyPrinted)    } catch let myJSONError {        print(myJSONError)    }    return nil;}

In SwiftyJSON you can use rawData method to get NSData:

if let encryptedData:NSData = json["encryptedData"].rawData() {    NSLog(NSString(data: encryptedData, encoding: NSUTF8StringEncoding)!)}

To generate JSON as you want you should convert data to array object:

if let encryptedDataArray = JSON(data: encryptedData).arrayObject {    let jsonObject:JSON = [        "transactionID" : 12345,        "encryptedData" : encryptedDataArray    ]    NSLog(NSString(data: jsonObject.rawData()!, encoding: NSUTF8StringEncoding)!)}

I have no idea on SwiftyJSON. I use following code snippet to convert between json and nsdata

// Convert from NSData to json objectpublic class func nsdataToJSON(data: NSData) -> AnyObject? {    return NSJSONSerialization.JSONObjectWithData(data, options: .MutableContainers, error: nil)}// Convert from JSON to nsdatapublic class func jsonToNSData(json: AnyObject) -> NSData?{    return NSJSONSerialization.dataWithJSONObject(json, options: .allZeros, error: nil)}