npm install problem, command not found

to get the default path:

npm config get prefix




 export PATH="/Users/username/npm/lib/node_modules/vue-cli/bin:$PATH"

$PATH="/Users/username/npm/lib/node_modules/vue-cli/bin:$PATH"

The default on OS X is /usr/local, which means that npm will symlink binaries into /usr/local/bin, which should already be on your PATH (especially if you're using Homebrew).