How to get all keys in json object in swift

Question

i have JSON object like below

{
"a":"123",
"b":"testing"
}

In java i am using JSONObject.names() method.

JSONArray keys = jsonObject.names();

And result getting like this ["a","b"];

Similar result how to get in swift?

Thanks.

What have you tried yourself and why are you working with swift 3, it's obsolete by now? — Joakim Danielson, Sep 10 '20 at 12:59

score 2 · Accepted Answer · answered Sep 10 '20 at 09:29

You can use JSONSerialization to parse the JSON data into a Dictionary of type [String:Any] and then use keys to get all the key strings from it.

do {
    if let dict = try JSONSerialization.jsonObject(with: data) as? [String:Any] {
        print(dict.keys)
    }
} catch {
    print(error)
}

score 1 · Answer 2 · answered Sep 10 '20 at 09:22

var results = [String:Array<DataModel>]

where,

class DataModel {
    var name: String?     
}

and to fetch the keys and value,

for i in 0...(results.length-1){
    // To print the results keys
    print(results.keys[results.startIndex.advancedBy(i)])
    // To get value from that key
    let valueFromKeyCount = (results[results.keys[results.startIndex.advancedBy(i)]] as Array<DataModel>).count
    for j in 0...(valueFromKeyCount-1) {
         let dm = results[results.keys[results.startIndex.advancedBy(i)]][j] as DataModel
         print(dm.name) 
    }
}

Your question is already answered here - How to fetch the key from JSON in Swift?

i have dynamic json ..how to return array of string from method — cj devin, Sep 10 '20 at 09:28
Your loops are pretty cumbersome. In Swift there is `for (key, value) in results`. And there is also `for i in 0.. — vadian, Sep 10 '20 at 10:02

How to get all keys in json object in swift

2 Answers2