how to get particular json value in swift

Question

I want the size value in json object but the problem is I'm getting whole json data i want only size value to print

here is my json

[{
   size = {
    height = 20
    width = 10
    },
    number = 100
}]

here is my code

     do{
            let Json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers)
            //print(Json as Any)

            guard let newValue = Json as? [[String: Any]] else {
                print("invalid format")
                return
            }
            print(newValue)

        }catch {
            print("Response Not Found.")
         }

You need to fetch size key only to print size. For reference follow this link stackoverflow.com/questions/40736924/… — Sarabjit Singh
– Sarabjit Singh, Commented Mar 8, 2019 at 11:19
My dear please try first and if you have any issue please let us know.... we will surely help you .... — Sarabjit Singh
– Sarabjit Singh, Commented Mar 8, 2019 at 11:22
Hey @username000, the model you are getting after parsing is array. You need to get to the index of that array first, then reach the key value pair. Your case will be newValue[<int index>]["Key"] or for trial you can do newValue.first["key"] — Saurabh Yadav
– Saurabh Yadav, Commented Mar 8, 2019 at 11:30

vadian · Accepted Answer · 2019-03-08 12:20:38Z

3

Please learn to read JSON, it's pretty easy, there are only two collection types:

[] is array, Swift [Any] but in almost all cases [[String:Any]], accessed with index subscription.
{} is dictionary, Swift [String:Any], accessed with key subscription

Never use the mutableContainers option in Swift, it has no effect at all.

if let json = try JSONSerialization.jsonObject(with: data!) as? [[String:Any]] {
    for item in json {
        if let size = item["size"] as? [String:Any] {
            print(size["height"], size["width"])
        }
    }
}

And variable names are supposed to start with a lowercase letter.

PS: You have to cast the type of height and width. The output – which is actually not JSON – is ambiguous, you cannot see if the value is String or Int

edited Mar 8, 2019 at 12:20

answered Mar 8, 2019 at 12:13

vadian

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2 Comments

Johnny Bueti Over a year ago

What is (was?) the mutableContainers option supposed to do?

vadian Over a year ago

@Fehniix it’s a Objective-C related option to assign the result to an NSMutable… object which makes no sense in Swift. And it makes no sense anyway if the result is assigned to a let constant.

Subash thapa · Accepted Answer · 2019-03-08 12:17:20Z

0

You just need to extract size from newValue . Try this

do  {
        let Json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers)
        guard let newValue = Json as? [[String: Any]],
            let size = newValue[0]["size"] as? [String:Any] else {
                return
        }
        print(size)
    }
    catch {
        print("Response Not Found.")
    }

edited Mar 8, 2019 at 12:17

answered Mar 8, 2019 at 12:11

Subash thapa

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Comments

Joakim Danielson · Accepted Answer · 2019-03-08 12:24:44Z

-1

guard let newValue = Json as? [[String: Any]] else {
     print("invalid format")
     return
}
print(newValue["size"])

or if you want height & width

var sizeDict = newValue["size"] as! [String:Any]

print("Width - \(sizeDict["width"])")
print("Width - \(sizeDict["height"])")

edited Mar 8, 2019 at 12:24

Joakim Danielson

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answered Mar 8, 2019 at 11:34

Friend

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5 Comments

username000 Over a year ago

im getting error Cannot subscript a value of type '[[String : Any]]' with an index of type 'String'

Saurabh Yadav Over a year ago

dictionary is present inside the array, newValue["size"] will be an error. You can correct your answer stating the same.

Friend Over a year ago

var sizeDict = newValue[0]["size"]

username000 Over a year ago

foreach statment

Friend Over a year ago

for dict in newValue { dict["size"] }

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