Ignoring null fields in Json.net

by

Yes you need to use JsonSerializerSettings.NullValueHandling = NullValueHandling.Ignore.

But because structs are value types you need to mark Field2, Field3 nullable to get the expected result:

public struct structA
{
    public string Field1;
    public structB? Field2;
    public structB? Field3;
}

Or just use classes instead of structs.

Documentation: NullValueHandling Enumeration

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