Very often we need to access some kind of service available on the internet to gather some data to work with. Most of nowadays services prefer to send data using the JSON format (learn more about json here). It’s simple and compared to XML, smaller.
In iOS there is no native way to work with json text, but there are some great library avaliable out there that make the job really easy. One of the best I know is the TouchJSON (a wiki about it is avaliable here). This library makes really simple the task to parse a JSON string.
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