How to convert Raw dictionary to JSON string? - json

Question

I have this type of dictionary:
{
“event”: {
“type”: “message_create”, “message_create”: {
“target”: {
“recipient_id”: “RECIPIENT_USER_ID”
}, “message_data”: {
“text”: “Hello World!”,
}
}
}
I want to convert this dictionary into JSON string format, but not able to do it. Please anyone guide me on this.
This is the code till I am trying after sending message I am getting bad authenticating data message from server -
func sendMessage(_ userInfo: String) {
let requestURL = URL(string: "https://api.twitter.com/1.1/direct_messages/events/new.json")
Alamofire.request(requestURL!, method: .post,
encoding: URLEncoding.default,
headers: getRequestHeader()).responseJSON { (response) in
print(response)
switch response.result {
case .success:
print("Validation Successful")
case .failure(let error):
print("FAILURE ERROR : \(error.localizedDescription)")
print("ERROR : \(error)")
if let data = response.data {
print("Print Server Error: " + String(data: data, encoding: String.Encoding.utf8)!)
}
}
}
}
// MARK: - Get Request Header
func getRequestHeader() -> ([String: String]) {
return ["authorization": "","CONSUMER_KEY":"",
"CONSUMER_SECRET":"",
"oauth_secret":"7W2Gx4KEjz7d164NPvJaOktzhaSPpV3VNjvyjpIqaDc02",
"oauth_token":"2605063830-IffuOmn2tEajFXY6khbzmeMwNoUvGkQ8qrYonzw",
"oauth_version":"1.0",
"oauth_signature_method":"HMAC-SHA1",
"Content-Type": "application/json"
]
}

Answer 1

For the purpose of focusing on getting the json string (without caring about how you got the dictionary), I would assume that your myDict is the dictionary that you want to convert to json string:
let json = """
{
"event": {
"type": "message_create", "message_create": {
"target": {
"recipient_id": "RECIPIENT_USER_ID"
},
"message_data": {
"text": "Hello World!"
}
}
}
}
""".data(using: .utf8)
var myDict: [String: Any] = [: ]
do {
if let dict = try JSONSerialization.jsonObject(with: json!, options: []) as? [String: Any] {
myDict = dict
}
} catch {
print(error)
}
So now we want to convert myDict as a json string:
do {
// converting `myDict` to Json Data, and then
// getting our json as string from the `jsonData`:
if let jsonData = try JSONSerialization.data(withJSONObject: myDict, options: []) as? Data,
let jsonString = String(data: jsonData, encoding: .utf8) {
print(jsonString)
}
} catch {
print(error)
}
jsonString is now what are you looking for! you should see on the log:
{"event":{"type":"message_create","message_create":{"target":{"recipient_id":"RECIPIENT_USER_ID"},"message_data":{"text":"Hello
World!"}}}}
which is perfectly valid json.

Answer 2

public extension NSDictionary{
public func toJSONString() -> String{
if JSONSerialization.isValidJSONObject(self) {
do{
let data = try JSONSerialization.data(withJSONObject: self, options: JSONSerialization.WritingOptions(rawValue: 0))
if let string = NSString(data: data, encoding: String.Encoding.utf8.rawValue) {
return string as String
}
}catch {
print("error")
}
}
return ""
}
}