Error in Node.js with Azure web app service

I am new to Node.js and I have created a basic application in node.js and trying to deploy on Azure web App service.

After successful deployment, when I am trying to hit a website it showing me two types of error like You do not have permission to view this directory or page. or website not responding.

In both cases, when I tried to trace the logs, it shows me following logs in the things you can try

1. If you do not want to enable directory browsing, ensure that a default document is configured and that the file exists.
2. Enable directory browsing using IIS Manager.
3. Open IIS Manager.
4. In the Features view, double-click Directory Browsing.
5. On the Directory Browsing page, in the Actions pane, click Enable.
6. Verify that the configuration/system.webServer/directoryBrowse@enabled attribute is set to true in the site or application configuration file.

How can I resolve the error?