That sounds, well novel. I would encourage you to review: (Free tier) https://auth0.com/ https://auth0.com/ (Free tier) https://firebase.google.com/docs/auth/

That sounds, well novel. I would encourage you to review: (Free tier) https://auth0.com/ https://auth0.com/ (Free tier) https://firebase.google.com/docs/auth/ https://firebase.google.com/docs/auth/ Review any other proven and secure user auth solution ie. http://www.passportjs.org/ http://www.passportjs.org/ Questions to asks yourself: How it will scale ? Is it compatible with PAM/LDAP ? Let say you want at least two servers for scale or high availability. How about social login ? How about forgotten password? How you can delegate the work on it ? (in case, you want more people work on it in future) For personal projects, get some paying clients first, worry later.