To serialize and deserialize JSON documents, we will use the NSJSONSerialization
class. As we will see, it is much easier to use the NSJSONSerialization
class with JSON documents than it is to use the NSXMLParser
class with XML documents; however, it can be more error-prone when we try to access the information. Just remember to always check values that are defined as optional for null prior to accessing them.
The NSJSONSerialization
class, unlike the NSXMLParser
class, will parse the entire JSON document memory and then return a JSON object back to you; therefore, there is a lot less code to write.
The NSJSONSerialization
class can parse JSON documents from an NSData
object or through a stream. To parse JSON documents from the various sources, we use the NSJSONSerialization
class with the appropriate static method:
JSONObjectWithData(_: options: error:): This initializer will parse a JSON document stored as an
NSData
objectJSONObjectWithStream(_: options: error...