JSONSerialization alternative (XCode 15.2 beta)

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Created Jun ’23

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I need to read an arbitrary JSON file – structure is not known up-front. I am trying to use JSONSerialization from Foundation (system details at the end).

The following code causes an error:

let ser = JSONSerialization()

The error:

Thread 1: "*** +[NSJSONSerialization allocWithZone:]: Do not create instances of NSJSONSerialization in this release"

I tried to have a look at the new Swift FoundationPreview package, however it does not seem to have JSONSerialization (as of today). It just has JSONCoder/JSONDecoder which require the values to be typed (Any can not be decodable).

I would prefer to stay within official set of packages/libraries/frameworks.

What is the (official) alternative to read an arbitrary JSON file?

System details:

OS: macOS Ventura – 13.4.1 (22F82)
XCode Version 15.0 beta 2 (15A5161b)

Answered by Scott in 757218022

You almost have it. Note that JSONSerialization is all class methods, not instance methods, so you call it like this:

let someArrayOrDictionary = try JSONSerialization.jsonObject(from: myDataObjectContainingJSON)

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Scott OP

Jun ’23

Accepted Answer

You almost have it. Note that JSONSerialization is all class methods, not instance methods, so you call it like this:

let someArrayOrDictionary = try JSONSerialization.jsonObject(from: myDataObjectContainingJSON)

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