[Vuejs]-How to manage user state in Firebase authentication within a SSR Nuxt.js application?

I was able to solve this problem by using the following:

• Express server – using axios posts to manage the login on receiving
  the request save the user ID in the session and save the access token
  in a cookie
• Vuex – store user state so easily accessible within my Nuxt application
• Nuxt server middleware – used to check the authentication status of
  the user on the server. Looking for user ID in the session or the
  access token in a cookie that would have been created on login

Access to the code containing a working, running example of this scenario can be found in this GitHub repository.

I have also written a more detailed blog entry regarding all the important files used in the project.