How to uninstall Node.js versions downloaded using nvm

To uninstall unwanted node versions downloaded using nvm:

• Open the terminal and run:

W=(16 17);WD=();V=$(nvm ls --no-colors --no-alias | cut -d'v' -f 2 | cut -d' ' -f 1 | tr '\n' ' ');for w in "${W[@]}";do WD+=("$(nvm version "$w" | cut -d'v' -f 2)");done;for v in ${V[@]};do if [[ " ${WD[*]} " =~ $v ]];then echo "Skipping v$v";else echo "Uninstalling v$v";nvm uninstall "$v";fi;done

• Or:

  1. Add the following function to ~/.bash_profile or ~/.bashrc

     function uninstallNodeVersions {
     	local wantedVersions=(16 17)
     	# credit: https://stackoverflow.com/a/1951523
     	local wantedDownloadedVersions=()
     	local allVersions
     	allVersions=$(nvm ls --no-colors --no-alias | cut -d'v' -f 2 | cut -d' ' -f 1 | tr '\n' ' ')
     	for wantedVersion in "${wantedVersions[@]}"; do
     		wantedDownloadedVersions+=("$(nvm version "${wantedVersion}" | cut -d'v' -f 2)")
     	done
     	echo "Wanted node versions:" "${wantedVersions[@]}"
     	echo "Downloaded node versions:" "${wantedDownloadedVersions[@]}"
     	echo "All node versions:" "${allVersions[@]}"
     	# shellcheck disable=SC2068
     	for version in ${allVersions[@]}; do
     		# credit: https://stackoverflow.com/a/15394738
     		if [[ " ${wantedDownloadedVersions[*]} " =~ ${version} ]]; then
     			echo "Skip uninstalling node ${version} ..."
     		else
     			echo "Uninstalling node v${version} ..."
     			nvm uninstall "${version}"
     		fi
     	done
     }

  2. Open the terminal and run the function: uninstallNodeVersions

  3. Enjoy!