I have created one app in iOS5.
I want to store and retrive data on web server.
For that I want to use JSON parser.
I have used demo given by ray wen
You may want to refer to SBJSON Framework which is frequently used for objective-C, I have used this framework in may of my iOS Apps.
You may get a reference about it from these links:
https://github.com/stig/json-framework
http://stig.github.com/json-framework/
Example Code: Also here is an example on, How to parse JSON with SBJSON Parser:
How to parse JSON into Objective C - SBJSON
http://jasarien.com/?p=428
Here is how you need to configure SBJSON into your app:
http://deshartman.wordpress.com/2011/09/02/configuring-sbjson-framework-for-xcode-4-2/
Hope this helps you.
Since you are a RayWenderlich Fan, They have a pretty amazing tutorial out there on the new iOS5 JSON Parser
I suggest you to used Twitter Framework for json, it's really easy to learn json, and you just have to used api of twitter, here is the all api available for twitter,
http://dev.twitter.com/console