You may use this command multiple times with the same user account to
authorize on a new machine. When authenticating on a new machine,
the username, password and email address must all match with
your existing record.
npm login is an alias to adduser and behaves exactly the same way.
The base URL of the npm package registry. If scope is also specified,
this registry will only be used for packages with that scope. scope defaults
to the scope of the project directory you're currently in, if any. See scope.
If specified, the user and login credentials given will be associated
with the specified scope. See scope. You can use both at the same time,