Note: This article only applies to users of the public npm registry.
If you need to install and publish private packages, you can upgrade to a paid user account plan. Our paid user account plan costs $7 per month. For more information, see the "npm account" column on our pricing page.
Your paid plan and billing cycle will start when you submit your credit card information, and you will be charged for the first month immediately.
Under "change plan", click Upgrade Plan ($7/User).
Under "Want to upgrade?", click Enable Private Publishing for $7/mo.
Click Pay $7.00.
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https://docs.npmjs.com/upgrading-to-a-paid-user-account-plan