There are several ways to install node on any mac, but my recomendation will be to install it using brew and nvm.
I think that is the best approach for several reasons:
Brew is an amazing package manager for mac that contains very mature packages already bullet prove on any possible bugs.
Install brew (if you don't have it already)
According to the brew official website you only to paste need one command on the console:
$ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
Install NVM using brew
$ brew install nvm
Load it in the terminal
$ mkdir -p ~/.nvm $ echo $'export NVM_DIR="$HOME/.nvm"\n. "/usr/local/opt/nvm/nvm.sh"' >> ~/.bash_profile
Restart your current terminal
sh
$ source ~/.bash_profile
Install node version 8 or whatever version you want
sh
$ nvm i 8
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