Let's say I have multiple Angular/React/Vue applications which I want to enable users to log in once and be able to access all my applications. What I want to solve / ask about is where should I keep my login logic and UI? thanks

Should I create a separate project just to keep all my login logic and UI?

Yes: Redirection and testing will be more complicated if I do that. If I want to test application A on localhost, I have to run SSO project and application A at the same time?

No: However, if I have login logic and UI in each project, there will be a lot of repeated code and ui. It would be hard to modify and maintain.

EDIT - to clarify my questions: Is it good to have a separate project for just login to enable SSO? If it is good, how to make the development and testing process for SSO easier? If it is not recommended, what should I do to reuse the same login code for multiple related projects?

  • Sounds like you might want to check out OAuth if you haven't already. As for where to put the stuff, typically it would go in a dedicated authentication server. You could have either centralized or federated identity and credential storage.
    – John Wu
    Jul 24, 2018 at 2:02
  • StackExchange wrote an article on this a while back, trying to find it for you. Details on how they implemented auth across their many sites. Jul 24, 2018 at 9:06
  • This might evolve into arguments pro and con either approach, which in part depends on the size and scope of the project. Some more information about those would be helpful.
    – jwenting
    Jul 24, 2018 at 10:12
  • @JohnWu I am more concerned about front-end project structure, testing and development process. I am using aws cognito.
    – Jun
    Jul 24, 2018 at 10:22

1 Answer 1


If there is any natural relations between your projects, then yes - even though it's harder to do. If not there's no real need to it.

Maybe a third party ID service would suit you like Google Facebook? The benefit is that you don't have to store that much user info you do if you build your own.

  • I am using aws services and they provide aws cognito.
    – Jun
    Jul 24, 2018 at 10:20

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