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?

try this `if json["shortName"] is nil` . or `if let shortName = json["shortName"] { print("shortName - \(shortName)") } else { print("shortName is nil") }` — Krunal, Mar 05 '18 at 10:00
if let _ = json["shortName"] as? String { // it is not null } — Ashwin Shrestha, Mar 05 '18 at 10:02
`json[0]["shortName"] is NSNull` **But it's always true. How can i handle it?** off course it will be true because its null — AamirR, Mar 05 '18 at 10:12
@AamirR but before it i got IF doesn't it make any difference ? — Michael, Mar 05 '18 at 10:13
Your code is `if json[0]["shortName"] is NSNull { SHORT NAME IS NULL } else { NOT NULL }`, its a working code — AamirR, Mar 05 '18 at 10:16
@Michael - Show your full json response and how do you store it into variable `json` — Krunal, Mar 05 '18 at 10:16
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] — Ashwin Shrestha, Mar 05 '18 at 10:16
@Krunal full json `[{ "id": "4635465675", "name": "Arts", "pluralName": "Arts", "shortName": null }]` and json variable `var json = JSON((response.text)?.data(using: .utf8))` — Michael, Mar 05 '18 at 10:18
@AshwinShrestha full json `[{ "id": "4635465675", "name": "Arts", "pluralName": "Arts", "shortName": null }]` — Michael, Mar 05 '18 at 10:19

score 23 · Accepted Answer · edited Jun 07 '20 at 15:28

23

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 {

edited Jun 07 '20 at 15:28

melbic

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answered Mar 05 '18 at 11:11

Anbu.Karthik

82,064
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YES, that's was exactly what i needed. THANKS – Michael Mar 05 '18 at 11:15
shouldn't `if json[0]["shortName"].stringValue == nil{` change to `if json[0]["shortName"].stringValue == ""{` as stringValue always returns String not String? – Wimukthi Rajapaksha Apr 06 '20 at 18:55
@WimukthiRajapaksha- thanks for your comment , we can also use like `if let getShortName = json[0]["shortName"].string,!getShortName.isEmpty { print(getShortName) }` – Anbu.Karthik Apr 07 '20 at 04:32

Krunal · Answer 2 · 2018-03-05T10:39:03.457

0

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.

edited Mar 05 '18 at 10:39

answered Mar 05 '18 at 10:21

Krunal

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Error: initializer for conditiobal binding must have Optional type – Michael Mar 05 '18 at 10:31
all lines returned "does not exist or it is null/nil" – Michael Mar 05 '18 at 10:37
Exact ouput for this line - `print("shortName does not exist or it is null/nil - \(jsonObject["shortName"])")` ? – Krunal Mar 05 '18 at 10:39

score 0 · Answer 3 · answered Mar 05 '18 at 10:50

0

Ok, that's was easier than i was thinking

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

answered Mar 05 '18 at 10:50

Michael

123
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9

swiftyJSON check if value is null

3 Answers3