How do I completely uninstall Node.js, and reinstall from beginning (Mac OS X)

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the best way (I've found) to completely uninstall node + npm is to do the following:

go to /usr/local/lib and delete any node and node_modules
go to /usr/local/include and delete any node and node_modules directory
if you installed with brew install node, then run brew uninstall node in your terminal
check your Home directory for any local or lib or include folders, and delete any node or node_modules from there
go to /usr/local/bin and delete any node executable
You may need to do the additional instructions as well:

sudo rm /usr/local/bin/npm
sudo rm /usr/local/share/man/man1/node.1
sudo rm /usr/local/lib/dtrace/node.d
sudo rm -rf ~/.npm
sudo rm -rf ~/.node-gyp
sudo rm /opt/local/bin/node
sudo rm /opt/local/include/node
sudo rm
–rf /usr/local/bin/node
sudo rm -rf /opt/local/lib/node_modules
sudo
 rm -rf /Users/[homedir]/.npm
sudo rm -rf /usr/local/bin/npm
sudo rm -rf /usr/local/share/man/man1/node.1 
sudo rm -rf /usr/local/lib/dtrace/node.d
Then install nodeJS via Node Version Manager

1. Install NVM by running the following in Terminal using cURL:

curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.25.4/install.sh | bash

or Wget:

wget -qO- https://raw.githubusercontent.com/creationix/nvm/v0.25.4/install.sh | bash

 2. 
 Update "$HOME/.bash_profile" to include the following lines:
 
export NVM_DIR="$HOME/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"  # This loads nvm
nvm use v0.12.4

3.
Install Node.js by running the following in Terminal:

 nvm install v0.10.31
 nvm install v0.12.0
 nvm install v0.12.4
 nvm alias default 0.12.4
 nvm use v0.12.4

4. 
source "$HOME/.bash_profile"