My swift app fail to convert NSData to Json

Question

I was trying to convert NSData to Json by doing this:

    let jdata = getJSON("https://api.myjson.com/bins/16j2i")

    do {
        let json = try NSJSONSerialization.JSONObjectWithData(jdata, options: []) as! [String: AnyObject]
        print(json)
    } catch {
        print("\(error)")
    }

This is the getJSON method

func getJSON(url:String) -> NSData {
    return NSData(contentsOfURL: NSURL(string: url)!)!
}

A error says that could not cast value of type '_NSCFArray' to 'NSDictionary'. Any ideas? Please

array of dictionaries: `[[String: AnyObject]]` – vikingosegundo May 10 '16 at 17:37 — vikingosegundo, May 10 '16 at 17:37

score 1 · Answer 1 · answered May 10 '16 at 17:41

The root element of your JSON is array not dictionary (Your format looks something like [{...},{...}] ). For fixing this error you need to change the parsing code to:

let json = try NSJSONSerialization.JSONObjectWithData(jdata, options: []) as! [[String: AnyObject]]

score 0 · Answer 2 · edited Apr 05 '18 at 09:48

0

let responseString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
let convert_array = responseString?.description
// Convert server json response to NSDictionary
do {
    if let convertedJsonIntoDict = try JSONSerialization.jsonObject(with: data!, options: []) as? NSArray {
       print(convertedJsonIntoDict)
    }

edited Apr 05 '18 at 09:48

GYaN

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answered Apr 05 '18 at 09:29

Softlabsindia

791
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11

score -1 · Answer 3 · answered Apr 05 '18 at 08:53

-1

let data = text.data(using: String.Encoding.utf8)

let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String:Any]

Working Fine for Swift 3.1 & Swift 4

answered Apr 05 '18 at 08:53

Softlabsindia

791
6
11

Please don't suggest `.mutableContainers`. The option is pointless in Swift. – vadian Apr 05 '18 at 08:57

My swift app fail to convert NSData to Json

3 Answers3