Error: Cannot find module '../lib/utils/unsupported.js' while using Ionic

Try to remove /usr/local/lib/node_modules/npm and reinstall node again. This should work.

sudo rm -rf /usr/local/lib/node_modules/npm
brew reinstall node

I followed the previous answers and reinstalled node. But I got this error.

Warning: The post-install step did not complete successfully You can try again using brew postinstall node

So I ran this command

sudo chown -R $(whoami):admin /usr/local/lib/node_modules/

Then ran

brew postinstall node

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