npm ERR! code E401 npm ERR! Incorrect or missing password

1. Try Deleting the package-lock.json file before running the command “npm install” after upgrading the node versions, if you have not done that.

2. If that will not work try removing the .npmrc file in $HOME directory as mentioned in this post.

NPM ERR Code E401: Unable to authenticate, need: Bearer authorization

Note – Deleting package-lock.json can have its own issues as mentioned in this posts, so go with this solution unless you find any better solution.

Deleting `package-lock.json` to Resolve Conflicts quickly