Summary

In this chapter, we have seen a very basic but quite representative implementation of an authentication mechanism. We have seen how FastAPI enables us to use standard-compliant authentication methods and we implemented one of the simplest possible yet effective solutions.

We have learned how elegant and flexible FastAPI and MongoDB are when it comes to defining granular roles and permissions, with the aid of Pydantic as the middleman. This chapter was focused exclusively on JWT tokens as the means of communication because it is the primary and most popular tool in single-page applications nowadays, and it enables great connectivity between services or microservices.

Finally, we created a simple React application and implemented a login mechanism that stores the user data in the state in memory. I have chosen not to show any solution of persisting the JWT token on purpose – the idea is just to see how a React application behaves with authenticated users and with...