'Error: EACCES: permission denied, access \'/usr/local/lib/node_modules/express-generator\'', code example
Example: npm EACCES: permission denied, access '/usr/local/lib'
sudo chown -R $(whoami) ~/.npm
mkdir ~/.npm-global
npm config set prefix '~/.npm-global'
export PATH=~/.npm-global/bin:$PATH
source ~/.profile