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Jansson is a C library, on iOS you use Objective-C. iOS 5 has native support for JSON, no external libraries are needed, see http://stackoverflow.com/questions/3562478/native-json-support-in-ios. http://json.org lists other (non-native) Objective-C implementations.
No, it doesn't work but, if you really want to : http://seiryu.home.comcast.net/~seiryu/libcurl-ios.html