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I am trying to get my head around the NSJSONSerialization Class Reference. In the lack of a code-example at the developer.apple.com website, I´m lost. There are millions of examples all around the web with other json libaries, but I haven´t been able to get any of them to work with the latest build of xcode. (I´m running: Version 4.3.1 (4E1019) and testing on iPhone 5.0.1)

I want to fetch the data from the json file into my iphone using a button.

Lets say I get my data from the URL: http://companyurl/jsonfile.json (standard JSON-format)

The jsonfile.json looks somthing like this…; 

{
  "companylist":   
[
      {
        "company":"Companyname 1",
        "telephone":"1234567890",
        "url":"http:\/\/www.companyname1.com\/",
        "category":"category 1",
        "position":"1",
      },
      {
        "company":"Companyname 2",
        "telephone":"2345678901",
        "url":"http:\/\/www.companyname2.com\/",
        "category":"category 2",
        "position":"2",
      },
      {
        "company":"Companyname 3",
        "telephone":"3456789012",
        "url":"http:\/\/www.companyname3.com\/",
        "category":"category 3",
        "position":"3",
      }
]
}

What do I write in my .h, and my .m file?

Thanks for any help! :)

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It helps to search before asking: how to use NSJSONSerialization, retrieving data from url – rickster Mar 17 '12 at 21:19
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4 Answers

up vote 6 down vote 
NSString *str=@"http://your_web_server/your_file....";
NSURL *url=[NSURL URLWithString:str];
NSData *data=[NSData dataWithContentsOfURL:url];
NSError *error=nil;
id response=[NSJSONSerialization JSONObjectWithData:data options:
                                NSJSONReadingMutableContainers error:&error]; 

NSLog(@"Your JSON Object: %@ Or Error is: %@", response, error);

NOTE: This code works on Xcode 4.2 with iOS 5.01 on simulator and 5.1 on iPad device at the moment

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response is id, not id* – hop Dec 16 '12 at 15:15
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up vote 5 down vote accepted

Thanks guys. I figured it out. (...and here is what I did:)

In my .m file I added this code:

    - (IBAction)getDataFromJson:(id)sender {
        NSURL *url = [NSURL URLWithString:@"http://yourwebsite.com/jsonfile.json"];

        NSData *jsonData = [NSData dataWithContentsOfURL:url];


        if(jsonData != nil)
        {
            NSError *error = nil;
            id result = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:&error];
            if (error == nil)
                NSLog(@"%@", result);
}
}

In my .h file, I added this code:

@interface ViewController : UIViewController
- (IBAction)getDataFromJson:(id)sender;
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up vote 0 down vote

There is a code example in the form of the Tweeting sample app.

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up vote 0 down vote

There's a great tutorial here. http://www.raywenderlich.com/5492/working-with-json-in-ios-5

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(I didnt get this one to work...-but I might have missed something.) – CustomCase Mar 30 '12 at 8:41
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