We want to implement a ready-made keycloak service into our project, but I can’t understand if there is a user login implementation without a password in the service? For example, a user enters a phone number, a code comes to him, which he enters and is successfully authorized
Built in to Keycloak, there are things you can use like WebAuthn for a “passwordless” device (like a Yubikey).
If you can install extensions, there are examples of magic links and email one-time passwords here:
And another example of using SMS to send a one-time password to a mobile here: