defaultdocument

The <defaultDocument> element in web.config may specify a default node.js application file that IIS will serve when the request URL does not specify any file name, e.g. http://localhost/node/defaultdocument/.

code [index.js]

var http = require('http');

http.createServer(function (req, res) {
    res.writeHead(200, {'Content-Type': 'text/html'});
    res.end('You have reached the default node.js application at index.js! [defaultdocument sample]');
}).listen(process.env.PORT); 

web.config

<configuration>
  <system.webServer>
    
    <!-- indicates that the index.js file is a node.js application 
    to be handled by the iisnode module -->
    
    <handlers>
      <add name="iisnode" path="index.js" verb="*" modules="iisnode" />
    </handlers>
    
    <!-- adds index.js to the default document list to allow 
    URLs that only specify the application root location, 
    e.g. http://mysite.antarescloud.com/ -->
    
    <defaultDocument enabled="true">
      <files>
        <add value="index.js" />
      </files>
    </defaultDocument>
    
  </system.webServer>
</configuration>