Answers for "node version with npm"

node js version

node --version  
//or
node -v

//v12.15.0

node version manager install

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.2/install.sh | bash

  OR

  wget -qO- https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.2/install.sh | bash

node version

$ node -v