how to do json parsing in iphone

i am using json parsing in my application and this is my json data is as follow :

{"response" : {"success":fal开发者_StackOverflowse,"error": {"code":7,"description":"You are not logged in"}}}

and i want description means "You are not logged in" i my string so how can i do that please help me.....

Check the blog post with sample code and step by step parsing of JSON.

http://www.xprogress.com/post-44-how-to-parse-json-files-on-iphone-in-objective-c-into-nsarray-and-nsdictionary/

http://pessoal.org/blog/2008/12/12/iphone-sdk-parsing-json-data/

http://mobileorchard.com/tutorial-json-over-http-on-the-iphone/

We're using CJSONDeserializer (TouchJSON library) in the iPhone app being developed at work.

Just use the following method:

NSDictionary * dictionary = [[CJSONDeserializer deserializer] deserializeAsDictionary:data error:&error];

where data is of type NSData *. It will convert the JSON string into a dictionary so you could get the value of description as follows:

[[[dictionary objectForKey:@"response"] objectForKey:@"error"] objectForKey:@"description"];