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Is there a class to parse JSON from a server in the iOS SDK? (similar to NSXML for XML and by extension RSS.)
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JSON is a popular data-interchange format used by APIs (application programming interfaces). JSON lets you bundle a large amount of data into one chunk of text and then send it along to another service.
An object that converts between JSON and the equivalent Foundation objects.
JSON (JavaScript Object Notation) is a lightweight format, which is widely used to send data over the internet. The JSON format includes dictionaries and arrays. In this tutorial some data is requested from a web server and displayed on screen. This tutorial is made with Xcode 10 and built for iOS 12.
You can use the Foundation framework's JSONSerialization class to convert JSON into Swift data types like Dictionary, Array, String, Number, and Bool.
As of iOS5 JSON is been natively supported, no need for 3rd party frameworks. This is supported by the NSJSONSerialization Class!
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Updated answer for iOS 5:
JSON support is now native to iOS with NSJSONSerialization, but in terms of performance, it pales in comparison to JSONKit, as John Englehart stated in the JSONKit README:
UPDATE: (2011/12/18) The benchmarks below were performed before Apples NSJSONSerialization was available (as of Mac OS X 10.7 and iOS 5). The obvious question is: Which is faster, NSJSONSerialization or JSONKit? According to this site, JSONKit is faster than NSJSONSerialization. Some quick "back of the envelope" calculations using the numbers reported, JSONKit appears to be approximately 25% to 40% faster than NSJSONSerialization, which is pretty significant.
Here's a blog post which delves into more specific benchmarks: JSON Libraries for iOS Comparison
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