Send emails in Node.js using Nodemailer, Gmail & oAuth2

hey i was thinking of adding a functionality where multiple users can send to other email user how can i do that do i have to ask for their client and secret id refresh token etc. or their is some way that i can authenticate without doing this?

There is a mistake in the installation command. It should be:

npm install nodemailer gooogleapis dotenv "gooogleapis" should appear with 2 'o's instead of 3

This is very clear and nicely summarized. Thank you!

after a week it show gaxios error GaxiosError: invalid_grant at async OAuth2Client.refreshTokenNoCach