title: What is the equivalent of Newtonsoft.Json DefaultValueHandling = DefaultValueHandling.Ignore option in System.Text.Json
body: <p>I'm migrating from <code>Newtonsoft.Json</code> to <code>System.Text.Json</code> in my .NET Core 3.0 application. </p>
  
  <p>How do I get have the same behaviour with <code>System.Text.Json</code> as I have in my .NET Core 2.2 app with <code>Newtonsoft.Json</code> configured with <code>DefaultValueHandling = DefaultValueHandling.Ignore</code>? You can find the <code>DefaultValueHandling</code> option described <a href="https://www.newtonsoft.com/json/help/html/T_Newtonsoft_Json_DefaultValueHandling.htm" rel="noreferrer">here</a>.</p>