Swift: Parsing JSON file

Question

I have the following JSON file:

{ "_id" : { "$oid" : "54feffe1412807551c90eaa2"} , "loc" : [ 35.09 , 12.01]},
{ "_id" : { "$oid" : "54ff0b62412807551c90eaa4"} , "loc" : [ 43.98 , 12.34]}

How can I parse this JSON file in Swift? I need the values in loc.

You could've easily found this by googling "xcode json to nsdictionary" — Arbitur, Mar 10 '15 at 23:52
possible duplicate of [Xcode Parse Json](http://stackoverflow.com/questions/26801506/xcode-parse-json) — Arbitur, Mar 10 '15 at 23:54

score 0 · Answer 1 · answered Mar 11 '15 at 00:07

I have the problem, that I get a fatal error: unexpectedly found nil while unwrapping an Optional value.

I send a http request to my server. Like this

        NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue()) {(response, data, error) in
        if error == nil {
            var datastring:String = NSString(data:data, encoding:NSUTF8StringEncoding)!
//          println(datastring)

            if (data != nil) {
                var json=NSJSONSerialization.JSONObjectWithData(data!, options: nil, error: &self.err) as NSDictionary
                println(json)

                if (error != nil) {
                    println(self.err?.localizedDescription)
                } else {
                  //do something here with json
                    }
                }
            } else {
                println(error.localizedDescription)
            }

and get this json file:

{ "_id" : { "$oid" : "54feffe1412807551c90eaa2"} , "loc" : [ 35.09 , 12.01]},
{ "_id" : { "$oid" : "54ff0b62412807551c90eaa4"} , "loc" : [ 43.98 , 12.34]}

If I have only one file it works. But with two files I get the fatal error.

Yes, Format is wrong. Please check on online validator tool. And For JSON you have pasted just put square braces on start and end. — , Mar 11 '15 at 10:14

score -1 · Answer 2 · answered Mar 10 '15 at 23:50

-1

Use NSJSONSerialization:

func ParseJSONData(data: NSData) -> NSDictionary? {
    if let dict = NSJSONSerialization.JSONObjectWithData(data, options: nil, error: nil) as? NSDictionary { return dict }

    println("Failed to parse")
    return nil
}

// *********************

if let info = ParseJSONData(jsonstring.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false))

answered Mar 10 '15 at 23:50

Arbitur

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is jsonstring NSData? – ruby4newb Mar 10 '15 at 23:59
I dont know what you will be using but for this example jsonstring is of course a String. – Arbitur Mar 11 '15 at 00:00
Please give me a purpose for the downvote, this is clearly what OP is asking for... – Arbitur Mar 11 '15 at 09:03
I didnt say it was you. – Arbitur Mar 11 '15 at 10:50

Swift: Parsing JSON file

2 Answers2