You can type dec/wwwroot after your azure app service url see bellow (https://mjxclient01.scm.azurewebsites.net/dev/wwwroot)
you can modify and run counsel too
also you can SCM before your domain on azure to access app inside
You can get access to powershill counsel by going to the following link:
https://senserver4.scm.azurewebsites.net/DebugConsole/?shell=powershell
in the counsel you can type for example: node –version to check the version of node running in your server