how to install npm version using nvm code example
Example 1: use nvm to install latest node
//lists all versions
nvm ls-remote
//installs the version you want (in this case version 14.0.0)
nvm install v14.0.0
//use the version that you installed as the default
nvm use v14.0.0
Example 2: install nvm
curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.34.0/install.sh | bash