We at ObjectGraph have mostly used SBJSON, An excellent library from Stig Brautaset which implements a strict JSON parser and generator in Objective-C. Recently we noticed others using TouchJSON and wanted to explore it to see if it offers any advantages over SBJSON.

There has been a good discussion on this subject on stackoverflow.com which can be read here.

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.

Related posts:

1. Encrypting / Decrypting / Base64 Encode / Decode in iPhone Objective-C I went through websites to find good tricks to send...
2. Download an Image and Save it as PNG or JPEG in iPhone SDK Here is a quick example to save an image as...
3. [iPhone Development] How to Parse HTML A few weeks ago, I was looking for a simple...
4. iPhone SDK 3.0 – Playing with Map Kit – Part 3 This is the 3 part of me Playing with Map...
5. iPhone SDK 3.0 – Playing with Game Kit – Part 1 My first series of articles explaining how to use Game...

Related posts brought to you by Yet Another Related Posts Plugin.