If you do not already have an npm user account, you can create an account in order to share and download JavaScript packages on the public registry.
Go to the npm signup page
In the user signup form, type in the fields:
Read the End User License Agreement and Privacy Policy, and indicate that you agree to them.
Click Create An Account.
Note: After signing up for an npm account, you will receive an account verification email. You must verify your email address in order to publish packages to the registry.
Use the npm login command to test logging in to your new account.
Note: If you misspell your existing account username when you log in with the npm login command, you will create a new account with the misspelled name. For help with accidentally-created accounts, contact npm Support.
On the command line, type the following command:
npm login
When prompted, enter your username, password, and email address.
If you have two-factor authentication enabled, when prompted, enter a one-time password.
To test that you have successfully logged in, type:
npm whoami
Your npm username should be displayed.