how-to-use-touch-json-and-sbjson/

http://blog.objectgraph.com/index.php/2010/02/24/how-to-use-touch-json-and-sbjson/
http://stackoverflow.com/questions/286087/best-json-library-to-use-when-developing-an-iphone-application


I will show how to use each of these libraries to decode JSON code in this post.

Touch JSON:
Include the following in your header

#import "CJSONDeserializer.h"

NSString *twitterTrendsUrl=@"http://search.twitter.com/trends.json";
NSData *flickrData=
[NSData dataWithContentsOfURL:[NSURL URLWithString:twitterTrendsUrl]];
NSError *theError = nil;
id theObject =
 [[CJSONDeserializer deserializer] deserialize:flickrData error:&theError];
NSLog(@"Error: %@", theError);
NSLog(@"Result: %@", theObject);

SB JSON:

The thing i like about SBJSON is it adds functions directly into NSString to get NSDictionary or NSArray objects when deserializing JSON strings.

Start with including the following header

#import "JSON.h"

Then you can simply use the following code

NSString *twitterTrendsUrl=@"http://search.twitter.com/trends.json";
NSString *output=
[NSString stringWithContentsOfURL:[NSURL URLWithString:twitterTrendsUrl]];
id theObject=	[output JSONValue];
NSLog(@"%@",theObject);

Please remember stringWithContentsOfURL has been deprecated so I would not recommend using it. We also just include the entire source of the specific JSON library when building our apps.