Is there a way to send the verification email with the Firebase Admin SDK from my Node.js server?

firebaser here

To my surprise there currently is no option to send verification email from within the Admin SDK. I'd recommend you file a feature request.

What you can do from the Admin SDK is update a user profile to mark their email as verified. This allows you to take control of the entire verification flow if you want to, finishing with a call to admin.auth().updateUser(...) (on Node.js, see the link for other supported languages).

I just came across the same problem as you. There is a function to generate the verification link using user's email address.

I used this function on an array of email addresses, then load the result to my mail automation API to send mails out. This function is weirdly not documented:

admin.auth().generateEmailVerificationLink([EMAIL_ADDRESS])