[Question] Why do we need an AuthenticationService?

[areebbeigh]

I'm just starting out with this tutorial series and I'm confused about why we need to use an AuthenticationService to register / login users? Can't we simply have a register/login form on the front end that submits to the express server through POST?

[s-gryt]

Verifying tokens in HTTP headers is one of the best authentication practices in single page applications. Register/login actually submits POST method to a server and Vue+Vuex is storing the token in a browser's local storage.