title: Access Json Serializer options to avoid serializing null in Azure Functions v3
body: <p>How can I setup the serializer in Azure Functions to ignore nulls when serializing?</p>
  <p>This is a v3 function</p>
  <p>I have tried</p>
  <pre><code>        JsonConvert.DefaultSettings = () =&gt; new JsonSerializerSettings
          {
              Formatting = Formatting.Indented,
              ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
              NullValueHandling = NullValueHandling.Ignore
          };
  </code></pre>
  <p>In the startup for my function</p>
  <p>I am now starting to think that Newtonsoft isnt being used for json</p>
  <p>How can I force Newtonsoft to be used?</p>
  <p>Cheers</p>
  <p>Paul</p>