swiftyJSON check if value is null

Question

I have a json which is array of dictionary

response.text = [{
"id": "4635465675",
"name": "Arts",
"pluralName": "Arts",
"shortName": null
}]

json = JSON((response.text)?.data(using: .utf8)) How can i check is value for key "shortName" null or not, say for first dictionary in the array ? I tried to do like this

if json[0]["shortName"] is NSNull

But it's always true. How can i handle it?

Complacent

try this if json["shortName"] is nil . or if let shortName = json["shortName"] { print("shortName - \(shortName)") } else { print("shortName is nil") } – Liu

if let _ = json["shortName"] as? String { // it is not null } – Chimpanzee

@AshwinShrestha didn't worked – Complacent

json[0]["shortName"] is NSNull But it's always true. How can i handle it? off course it will be true because its null – Conscious

@Liu didn't worked too – Complacent

Try this. if let name = Json.first?.["shortname"] { } – Presbyterian

@Conscious but before it i got IF doesn't it make any difference ? – Complacent

@ShauketSheikh nothing :( – Complacent

Your code is if json[0]["shortName"] is NSNull { SHORT NAME IS NULL } else { NOT NULL }, its a working code – Conscious

@Complacent - Show your full json response and how do you store it into variable json – Liu

but your json is a dictionary say [String:String], not array of dictionary objects [[String:String]], so i dont know why you are trying to access the first element of json using the index[0] – Chimpanzee

@Liu full json [{ "id": "4635465675", "name": "Arts", "pluralName": "Arts", "shortName": null }] and json variable var json = JSON((response.text)?.data(using: .utf8)) – Complacent

@AshwinShrestha full json [{ "id": "4635465675", "name": "Arts", "pluralName": "Arts", "shortName": null }] – Complacent

Answer 1

you can directly check as the key of JSON.null

if json[0]["shortName"] == JSON.null {
// show the alert

}

if its your String

if json[0]["shortName"].string == nil {

Catheryncatheter

YES, that's was exactly what i needed. THANKS – Complacent

shouldn't if json[0]["shortName"].stringValue == nil{ change to if json[0]["shortName"].stringValue == ""{ as stringValue always returns String not String? – Mover

@WimukthiRajapaksha- thanks for your comment , we can also use like if let getShortName = json[0]["shortName"].string,!getShortName.isEmpty { print(getShortName) } – Catheryncatheter

Answer 2

Execute following code and see

let jsonArray = [{ "id": "4635465675", "name": "Arts", "pluralName": "Arts", "shortName": null }] 

if let jsonObject = jsonArray[0] as? [String : Any] {

    if let id = jsonObject["id"] as? String {
       print("id - \(id)")
    } else {
       print("id does not exist or it is null/nil")
    }

    if let name = jsonObject["name"] as? String {
       print("name - \(name)")
    } else {
       print("name does not exist or it is null/nil")
    }

    if let pluralName = jsonObject["pluralName"] as? String {
       print("pluralName - \(pluralName)")
    } else {
       print("pluralName does not exist or it is null/nil")
    }

    if let shortName = jsonObject["shortName"] as? String {
       print("shortName - \(shortName)")
    } else {
       print("shortName does not exist or it is null/nil - \(jsonObject["shortName"])")
    }


}

Share here result of this code.

Liu

Error: initializer for conditiobal binding must have Optional type – Complacent

all lines returned "does not exist or it is null/nil" – Complacent

Exact ouput for this line - print("shortName does not exist or it is null/nil - \(jsonObject["shortName"])") ? – Liu

Answer 3

Ok, that's was easier than i was thinking

if json[0]["shortName"].string == nil {
//null
}else{
//not null
}

Complacent