The JSONSerialization class method jsonObject(with:options:) returns a value of type Any and throws an error if the data couldn’t be parsed. This post describes a few approaches you can take when working with JSON in your apps. However, because you can’t be sure of the structure or values of JSON your app receives, it can be challenging to deserialize model objects correctly. You can use the Foundation framework’s JSONSerialization class to convert JSON into Swift data types like Dictionary, Array, String, Number, and Bool. If your app communicates with a web application, information returned from the server is often formatted as JSON. For the latest news, visit the Swift open source blog If let backToJson = try? jsonEncoder.Swift is now open source. Your Swift 4 JSON playground or playground page: This is very verboseĪnd tedious to write so I am not going to bother to demonstrate it here.īut in Swift 4, this is even easier than decoding. JSONSerialization to convert the Dictionary back to JSON. Written a method for each struct that created a Dictionary and then used Lot in my code for readability but which are not relevant when comparing codeĮncoding back to JSON is very similar. I also removed the blank lines which I always use a self, from: jsonData)įor comparative purposes, I counted the lines of code in each, removing theĬommon boiler plate of the top of each and the two lines for displaying the Let geo = Coordinates(dict: geoDict) else

Let address = Address(dict: addressDict), Import Foundation let sampleDataAddress = '' let url = URL(string: sampleDataAddress) ! let jsonData = try! Data(contentsOf: url) (These are now called Data, DictionaryĪnd Array, but those labels are so universal, that I sometimes feel a more Swift hasĪlways provided access to the Objective-C methods for converting JSON to andįrom NSData, NSDictionary and NSArray. Swift which involves a lot of type casting, checking, optionals etc. The problem has always been converting loosely typed JSON to strictly typed What has Swift 4 done to sherlock them all? Internet, there has always been a lot of interest in Swift libraries to parse Since JSON has become the de facto standard for data transfers around the

Json to swift converter