npm ERR! Error: EACCES: permission denied, symlink code example

Example 1: 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

Example 2: npm ERR! Error: EACCES: permission denied, symlink '../lib/node_modules/@angular/cli/bin/ng' -> '/usr/bin/ng'

sudo npm install -g @angular/cli
sudo chown -R $USER /usr/local/lib/node_modules