NPM установить не работать за прокси -сервером
npm config set strict-ssl false
# Set npm to use http instead of https
npm config set registry "http://registry.npmjs.org/"
# install your package with below syntax, can leave out the
# username:password section if your proxy does not require
# you to authenticate. The "http://" part is very important
npm --proxy http://username:password@cacheaddress.com.br:80 install packagename
Worried Wildebeest