If npm takes registry url attribute from global npmrc config file and not from the file which is in your home directory then you want to modify global config npmrc but you can not update as you do not have root privileges.
You can set local registry url for your npm commands.
npm config set registry https://registry.npmjs.org/
Now the url which is mentioned in global npmrc file will not be effective and it downloads package from this url only.
When you close the terminal and open new terminal, you need to run this command every time. To get rid off this, you need to add this command in your ~/.bashrc file, now whenever you open terminal, this command will be executed automatically in the background.
