'How can single user registration and login work for separate Laravel applications

I need to set up a single user registration and login page to work for separate Laravel applications or projects, such that if a user registers on the first application, he or she can use that profile to login into the other application without needing to register again on the second application.



Solution 1:[1]

The most basic approach would be to connect both projects to the same database, and make sure they both have the same application key (the APP_KEY entry) set in the .env file, as this is what is used for the EncryptionServiceProvider.

A more complete, and thought-through approach would be to implement some form of Single Sign On (SSO) in both projects. Something such as zefy/laravel-sso could be a good starting point.

Yet another option, if it fits your usecase, might be to implement Social Authentication instead. Each project would maintain their own record of users, but since authentication would happen via third parties, that might not matter. Socialite might be a good starting point for this.

Solution 2:[2]

A good approach is to ensure that in the other applications there is an authentication to the database or services warehousing the user credentials your application should be able to reach this endpoint and check if that user is already authenticated/validated/signed you can check

https://www.cloudways.com/blog/setup-laravel-login-authentication/

Sources

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Source: Stack Overflow

Solution Source
Solution 1
Solution 2 Femi Daniel