@NullCodable

@NullCodable is a property wrapper that encodes nil optional values as null when encoded using JSONEncoder.

On its own, JSONEncoder will omit optional properties that are nil - meaning that this:

struct Test: Codable {
  var name: String? = nil
}

will be encoded as: {}.

If for some reason, you would like optional properties that are nil to be encoded in JSON as null, then marking those properties as @NullCodable will do so.

For example, adding @NullCodable like this:

  struct Test: Codable {
    @NullCodable var name: String? = nil
  }

will encode as: {\"name\": null}.