Feedback json format wrong - ios

Question

This is my feedback json string:
{"name":"abc", "cardNumber":"1234567890", "data": [{A data},{B data}...]}
I use this function to send data, then get json and encode:
func uploadData(word:String){
var request = URLRequest(url: url!, cachePolicy: .reloadIgnoringLocalAndRemoteCacheData, timeoutInterval: 30)
request.httpMethod = "POST"
request.httpBody = word.data(using: .utf8)
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
let session = URLSession(configuration: URLSessionConfiguration.default)
session.dataTask(with: request, completionHandler: {(data, response, error) in
if let data = data{
do{
let data = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.mutableContainers)
print(data) //I want to know what is this so I print
}catch{
print(error.localizedDescription)
}
}
}).resume()
}
But the console always says:The data couldn't be read because it isn't in the correct format
This json can be format and read in android if I use JSONObject.getJSONArray("myValue")...
I try to use print(data)(without json encode) to show if there is any data in feedback and I get 400byte in console, so I'm sure there is data send back to me.
UPDATE 12/28:
{"name":"abc",
"cardNumber":"1234567890",
"data": [{day:20171228, time: 09:10:11},
{day:20171226, time: 20:00:12},
{day:20171227, time: 15:30:22}
]
}
I'm sure this json can be read in android, the receiver and sender I use is vb.net, it use sendingString = JsonConvert.SerializeObject(JSONClass) to become json string, then convert to byte to send out.
UPDATE 12/28 new
After trying so much, I found string can get the feedback, but the value of name is Chinese word, other value is English and number, only name is unreadable, now I'm checking which String.Encoding will work, then if I encode it success, I will try to format to json Array.

Answer 1

Can you try this one?
func uploadData(word:String){
var request = URLRequest(url: url!, cachePolicy: .reloadIgnoringLocalAndRemoteCacheData, timeoutInterval: 30)
request.httpMethod = "POST"
request.httpBody = word.data(using: .utf8)
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
let session = URLSession(configuration: URLSessionConfiguration.default)
session.dataTask(with: request, completionHandler: {(data, response, error) in
if let data = data{
if let returnData = String(data: data!, encoding: .utf8) {
print(returnData)
} else {
print("Invalid Data Coming")
}
do{
let data = try JSONSerialization.jsonObject(with: data, options: []) as? [String: AnyObject]
print(data) //I want to know what is this so I print
}catch{
print(error.localizedDescription)
}
}
}).resume()
}