Checking for an existing user

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hi there! is there any way we can check from the frontend if an inputted email already belongs to an existing user? i.e. if the email already exists, show a message

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Hi @juliachxng,

Welcome to the Auth0 Community!

To check if a user already exists, the Management Api can be called using the Search Users by Email - GET /v2/users-by-email. However, the recommended best practice is to call the Management Api from the backend, since doing this from the frontend will expose the Management Api Access Token.

In order to generate a more specific message to the user when they sign up using an already existing email you can disable the “Use a generic response in public signup API error message” setting from the Auth0 Dashboard - Tenant Settings - Advanced.

  • If enabled, this will return a non-specific error message in the public signup API which will prevent users from being able to find out if an e-mail address or username has previously registered to prevent enumeration attacks, such as “We’re sorry, something went wrong when attempting to sign up.”

  • If disabled, users will receive clearer messages (e.g., “The user already exists.”) during signup attempts.

You can check out this article How to Show a Specific Error Message When a User Signs Up with an Existing Email for more details.

Best regards,
Remus

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