Usernames, passwords, refresh tokens - oh my!
Rolling your own authentication is hard. And it's risky! Unless you're a megacorp with a dedicated security team, you're better off using a free AuthN/Z provider for managing your users' credentials.
This library will help you do just that using a Social Identity Provider (IdP) like Google, Facebook, or Twitter. It's a wrapper around the Auth0 Social API, which is a wrapper around the OAuth2 protocol. It's a wrapper around a wrapper around a protocol. It's turtles all the way down.
Let Auth0 handle your OAuth user flow and storing those sweet, sweet credentials. You just focus on building your app.