web.config

<configuration>
  <system.webServer>
    <modules>
        <remove name="WebDAVModule" />
    </modules>

    <!-- indicates that the server.js file is a node.js application
    to be handled by the iisnode module -->
    <handlers>
            <remove name="FlaskHandler" />
            <remove name="WebDAV" />
            <add name="iisnode" path="server.js" verb="*" modules="iisnode" />
            <add name="WebDAV" path="*" verb="*" modules="WebDAVModule" resourceType="Unspecified" requireAccess="Execute" />
    </handlers>

    <rewrite>
      <rules>
        <!-- Rewrite all other urls in order for verdaccio to handle these -->
        <rule name="verdaccio">
            <match url="/*" />
            <action type="Rewrite" url="server.js" />
        </rule>
      </rules>
    </rewrite>
    
    <!-- exclude node_modules directory and subdirectories from serving
    by IIS since these are implementation details of node.js applications -->
    <security>
      <requestFiltering>
        <hiddenSegments>
          <add segment="node_modules" />
        </hiddenSegments>
      </requestFiltering>
    </security>
    <iisnode nodeProcessCommandLine="C:\Program Files\nodejs\node.exe" />
  </system.webServer>
</configuration>