Tecadmin published a tutorial about installing NVM on Debian 9.
How To Install NVM on Debian 9
NVM is a command-line version manager for the Node.js programming language. With the help of nvm utility, you can install multiple node.js versions on a single machine. You can also choose specific Node version for applications. You can also create an .nvmrc configuration file to auto select Node version.
How To Install NVM on Debian 9