How to check if user already exists in Supabase?

Question

How can I check if a user with the same email already exists when Enable email confirmations is turned on.

When Enable email confirmations are turned on an obfuscated / fake user object is returned by supabase, according to this comment it's a feature.

How can I check if the email already exists without turning off Email confirmation?

I tried passing using supabase.auth.api.getUser, but that needs JWT, not the user id.

interesting choice but according to github.com/supabase/supabase-js/issues/… you shouldn't need to check since the user is redirected via mail back to your application — zapl
– zapl, Commented Sep 21, 2022 at 16:42

Philipp · Accepted Answer · 2023-04-18 18:50:38Z

12

Not sure if following is the correct way but I do it as follows (TypeScript):

const [errorMsg, setErrorMsg] = useState<string | null>(null);
const [successMsg, setSuccessMsg] = useState<string | null>(null);

async function signUp(formData: Values) {
  const { data, error } = await supabase.auth.signUp({
    email: formData.email,
    password: formData.password,
  });

  if (error) {
    setErrorMsg(error.message);
  } else if (data.user?.identities?.length === 0) {
    setErrorMsg('User already registered');
  } else {
    setSuccessMsg('Success! Please check your inbox.');
  }
}

data.user?.identities?.length is 0 when the user is registered already.

answered Apr 18, 2023 at 18:50

Philipp

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2 Comments

verymadmango Over a year ago

I didn't fully understand why identities would be empty if a user is registered so I thought I'd add to this answer: If signUp() is called for an existing confirmed user: When both Confirm email and Confirm phone (even when phone provider is disabled) are enabled in your project, an obfuscated/fake user object is returned. Source: supabase.com/docs/reference/javascript/auth-signup

Jasperan Oct 22 at 21:07

Note: this works only for accounts with confirmed emails. You can add an extra check !data.user?.confirmed_at to check for if an account exists that has not yet confirmed their email.

Roshan Dash · Accepted Answer · 2024-11-02 07:08:55Z

1

Just go to providers and disable phone confirmation even if phone provider is disabled. Then you will get it in errors field. That user_already_exists

https://supabase.com/docs/reference/javascript/auth-signup

answered Nov 2, 2024 at 7:08

Roshan Dash

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Comments

Shivam Dargan · Accepted Answer · 2024-11-11 13:38:03Z

1

Going to the providers section and disabling phone confirmation fixes the issue, make sure to disable the phone confirmation and not just the phone provider, doing these will result in supabase finally giving the user already registered error.

Disabling The Phone Confirmation Under Providers (Phone)

answered Nov 11, 2024 at 13:38

Shivam Dargan

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