Firebase, React , Redux

Hello everyone,

Currently I'm having a app that runs with node API that connects with the react and redux with firebase. I'm bit confused when it comes to user authentication, do I have to connect with api or just go from redux with firebase with not touching the api.

If its from node + firebase how do I store the token that return from firebase. Does storing localstorage is secure ? help me out.

hope this question makes sense.