Installing packages from github npm registry – auth error 401

You need to generate a personal access token on Github and add it to your npm config in addition to setting the registry in the npm config:

• In Github navigate to https://github.com/settings/tokens (Settings > Developer settings > Personal access tokens) and you should see something like this:

• Click Generate new token
• From the permissions select at least read:packages

• Click Generate token and copy the token

• Add the following to your local .npmrc:

  @${OWNER}:registry=https://npm.pkg.github.com
  //npm.pkg.github.com/:_authToken=${TOKEN}
  

See the relevant Github Packages documentation

Related: For Github Actions, be aware of the difference between the GITHUB_TOKEN and a personal access token. The Github Token’s permissions are limited to the repository that contains your workflow. For anything else (including granular permissions beyond those allowed for the Github Token) you need a personal access token.