I'm learning nodeJs. I managed to run nodejs commands on cmd and it works fine. Now I want to install express framework and for that in the tutorial I'm following it asks to type
sudo install -g express
cmd.exe , I guess you would have node installed but still run
node -v , it should respond with the version meaning it's working.
Now if you want to explicitly install express.js you just have to run on, the command prompt itself,
npm install express -g.
Anyways you can follow this link from their official website. Hope it helps. Also
sudo is a program for Unix like operating systems, just in case you needed it.