Firebase Auth NodeJS Browser Login

What?

This library provides the function signInWithBrowser that could be used from NodeJS applications in order to open up a browser and log in from there.

Why?

There are use cases where you may want to support Google, Facebook or other third-party authentication and authorization services in your NodeJS app. For example, if you are building a CLI that requires users to log in, it may be easier for users to log in with, for example - Google. Currently, as the Firebase's client SDK does not support federated authentication when running in NodeJS, this functionality is a bit hard to achieve only by using the Firebase SDK.

How?

In order to use this library, first install it through npm:

npm i @vmutafov/firebase-auth-node-browser

After that, you only need to call the signInWithBrowser function:

import { getAuth, GoogleAuthProvider } from "firebase/auth";
import { signInWithBrowser } from "@vmutafov/firebase-auth-node-browser";

const auth = getAuth();
const userCredential = await signInWithBrowser(auth, new GoogleAuthProvider());

You can either pass a single AuthProvider like in the example above or pass multiple ones:

import { getAuth, GoogleAuthProvider, FacebookAuthProvider, EmailAuthProvider } from "firebase/auth";
import { signInWithBrowser } from "@vmutafov/firebase-auth-node-browser";

const auth = getAuth();
const authProviders = [new GoogleAuthProvider(), new FacebookAuthProvider(), new EmailAuthProvider()]
const userCredential = await signInWithBrowser(auth, authProviders);

The difference with this approach is that when signInWithBrowser is called, the user would be able to choose between all authentication providers. Internally, this library uses FirebaseUI for Web and the UI is the default one from it.

Demo?

There is an example project inside the demo folder. In order to start it, run npm i and then npm start. You should then be navigated to your default browser and you should see the different authentication options.