How to install nvm in mac?

I am unable to install nvm in my mac. I have installed node and it's running perfectly fine but unable to install nvm on my system. while checking node version it showing :


node -v v21.3.0


but when i try to check nvm version it gives me error :


nvm -v zsh: command not found: nvm


when i try to install nvm it gives me error :


brew install nvm


Warning: nvm 0.39.5 is already installed and up-to-date.
To reinstall 0.39.5, run:
brew reinstall nvm