If Node.js is installed on your computer but the command prompt is still showing the error, this can be caused due to Node.js not being recognized by the system.

Fix WMIC is not recognized as an internal or external command, operable program or batch file error by defining an Environment Variable.

Read: Java is not recognized as internal or external command How to install npm in cmd? To download NPM in CMD, you need to download the latest version package of Node.js from the official website.