For Windows users, run npm
commands from the Command Prompt (cmd.exe), not Node.Js (node.exe). So your "normal shell" is cmd.exe. (I agree this message can be confusing for a Windows, Node newbie.)
By the way, the Node.js Command Prompt is actually just an easy shortcut to cmd.exe.
Below is an example screenshot for installing grunt from cmd.exe:
![enter image description here](https://i.stack.imgur.com/NJV8s.png)
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…