I encountered a strange npm error when I switched Node.js versions.

I started to get the following error whenever I tried to install a package:

npm install html-react-parser
npm ERR! Darwin 15.3.0
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "install" "html-react-parser"
npm ERR! node v7.0.0
npm ERR! npm  v3.10.8
npm ERR! code MODULE_NOT_FOUND

npm ERR! Cannot find module 'internal/fs'

In the end, what fixed it for me was when I switched back to the previous version of node and updated npm:

nvm use node && npm update --global npm

If that doesn’t work for you, then you may also need to clean cache, install latest Node.js, and update npm:

npm cache clean && nvm use node && npm update -g