How do I compress a Json result from ASP.NET MVC

To configure json compression, you can open the web.config file, then add the configuration as shown below.

<system.webServer>
    <urlCompression doDynamicCompression="true" />
    <httpCompression>
      <dynamicTypes>
        <add mimeType="application/json" enabled="true" />
        <add mimeType="application/json; charset=utf-8" enabled="true" />
      </dynamicTypes>
    </httpCompression>    
</system.webServer>

Run your web site, then right-click-> Inspect, you can see your json results compressed with gzip.