How to include null value in the JSON via NSJSONSerialization?

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.

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"]

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