Read about a proxy variable in a .npmrc file but it does not work. Trying to avoid manually downloading all require packages and installing.
I tried all of these options, but my proxy wasn't having any of it for some reason. Then, born out of desparation/despair, I randomly tried curl in my Git Bash shell, and it worked.
Unsetting all of the proxy options using
npm config rm proxy
npm config rm https-proxy
And then running npm install in my Git Bash shell worked perfectly. I don't know how it's set up correctly for the proxy and the Windows cmd prompt isn't, but it worked.