Learning about the Site URL and redirect URLs

I’ll finish this chapter by explaining to you the very important, but very easy-to-digest, information about the URL configurations in Supabase. I’ll cover what they are, why they are important, and where to change them.

Previously, in our short trip to signInWithOtp, I showed the following code snippet:

supabase.auth.signInWithOtp({
  email,
  options: {
    emailRedirectTo: "http://localhost:3000/tickets",
  },
});

The emailRedirectTo value contains the URL that you want the Auth Service to redirect the user to after validating a token from the magic link. Although we didn’t use any emailRedirectTo value in our first implementation with signInWithOtp, it still redirected us to http://localhost:3000/.

However, that wasn’t because the Supabase client knew where our application runs. It was a happy coincidence that this is the default value...