If Java is not recognized as internal or external command, you need to make sure that the installation is not problematic and its path is recognized as system variables.

I hope this guide helped you to fix the issue. Read: Java is not recognized as internal or external command How to install npm in cmd?

This command will show the installed version of Node.js if the PATH is set correctly. How to Fix the 'npm' is not recognized as an internal or external command Error ...