How to include null value in the JSON via NSJSONSerialization?

Question

I think I get it how to use the NSJSONSerialization over all. The call I am making is:

[NSJSONSerialization dataWithJSONObject:parameters options:0 error:&a         


        

Answer 1

If you are using Swifty JSON, I've just created a PR that should handle nil. It's not merged yet and might need some improvements. The part that describes how to do that should be a good start to write your own implementation if you need to. The logic is not that complicated but there might be tricky edge cases/performance things to think about.

I know it's not a direct response to the question since it's replacing NSJSONSerialization, but I hope it can help some people frustrated by how Swift handles nil/json!

Answer 2

I tried doing this and worked for me.

var param: [String:Any] = [:]

param["firstName"] = "somename"

param["middleName"] = NSNull()

param["lastName"] = "somename"

print(param)

Result:

["firstName":"somename","middleName":null,"lastName":"somename"]

Answer 3

Just try something like this:

NSDictionary *jsonObj = [NSDictionary dictionaryWithObjectsAndKeys:@"My Name", @"name", @"Developer", @"occupation", NULL, @"My NULL field", nil];

and use this object as parameter where you want it.

Answer 4

You have to use NSNull. For instance

Swift

let dict = ["firstKeyHasValue": 2342, "secondKeyHasNoValue": NSNull()]

Objective-C

NSDictionary *dict = @{ @"error": [NSNull null] };

From the official documentation of NSDictionary:

Neither a key nor a value can be nil; if you need to represent a null value in a dictionary, you should use NSNull.