Firebase email verification workflow

Question

I have a simple input box asking for users emails.

I want them to input something, for me to check it is a string, and then send a verification email to their email addr

Answer 1

I have a simple input box asking for users emails.

I want them to input something, for me to check it is a string, and then send a verification email to their email address entered.

Then once verified within users mail client and the link is clicked, I want the user to be added to my Firebase users.

I do not think Firebase works that way. Unless the user is registered, you cannot send a verification email to an arbitrary email address. The sendEmailVerification method works on a currentUser.

According to the docs:

You can send an address verification email to a user with the sendEmailVerification method

Now, to your snippet, aren't you simply trying to take a user input and save it to the database? With the recent SDK, you can try this, as per docs

....

var database = firebase.database();

function signup(formObj) {
    // Store emails to firebase
    database.ref('signups')
      .push({
         email: formObj.email.value,
      })
      .then(function(res) {
         console.log(res)
         // call whatever callback you want here
      })
      .catch( .... )
}

Answer 2

FYI if you are using Firebase email verification think about testing it during your end-to-end or smoke tests.

Use a service like emaile2e.com to generate random email addresses during a test which you can send and receive from. That way you can verify users during a test programmatically.