NSJSONSerialization allows you to easily convert an NSArray or NSDictionary to JSON, but does not work directly with Swift structs.
Emil Loer has written a nice tutorial about how you can quickly convert a Swift struct to JSON by using a protocol and the Swift Reflections compatible with NSJSONSerialization , and also how you can easily go a step further so that you can easily serialize data types that are not supported by NSJSONSerialization such as NSDate.
You can find the tutorial over on the Codelle website.
A nice guide on how you can use Swift features to very cleanly convert Swift structs to JSON.
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