does uninstall npm uninstall all packages code example
Example 1: webpack uninstall npm
npm uninstall sax
Example 2: remove all packages npm
npm ls -gp --depth=0 | awk -F/ '/node_modules/ && !/\/npm$/ {print $NF}' | xargs npm -g rm
npm uninstall sax
npm ls -gp --depth=0 | awk -F/ '/node_modules/ && !/\/npm$/ {print $NF}' | xargs npm -g rm