How do I use the local Firebase Auth emulator and not production auth to test my users?

Question

My app still expects to validate users with the production firebase-auth instance, despite having initialised the auth emulator locally with:

firebase init emulators

This is the auth logic in my React app:

const handleLogin = () => 
  authentication.signInWithEmailAndPassword("emulator@test.com", "emulator");

After handleLogin is triggered, I get the error "auth/user-not-found" as firebase is querying the production auth instance instead.

score 6 · Accepted Answer · edited Sep 18 '22 at 21:31

6

You need to call useEmulator synchronously, right after initialisation of your app’s auth instance. useEmulator takes the local emulator URL as its only argument.

You need the following wherever your firebase auth instance is initialised:

Firebase SDK Version 9 with tree shaking

import { getAuth, connectAuthEmulator } from "firebase/auth";

const auth = getAuth();
connectAuthEmulator(auth, "http://localhost:9099");

Firebase SDK Version 8

import firebase from "./firebase-config";
import "firebase/auth";

const authentication = firebase.auth();
    
authentication.useEmulator("http://localhost:9099");
    
export default authentication;

edited Sep 18 '22 at 21:31

Philippe Fanaro

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answered Feb 03 '21 at 14:03

Stephanos

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Not working with the new version, btw `connectAuthEmulator` only is available, no "useEmulator". – Mycolaos Feb 23 '22 at 17:07
1

Indeed @Mycolaos thanks for point this out, it has changed in v9, i will update the answer – Stephanos Feb 24 '22 at 18:15
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I meant, that even in the new version (with `connectAuthEmulator`) this didn't work for me. – Mycolaos Feb 26 '22 at 10:40
I'm using emulator in my staging environment but I can't use ssl certificate with connectAuthEmulator(), had you to deal with this? – Marco Di Gioia Sep 21 '22 at 23:54
@MarcoDiGioia I haven't no I'm afraid, not sure how that would work – Stephanos Sep 22 '22 at 16:37
for server side applications set `FIREBASE_AUTH_EMULATOR_HOST` – chandan Feb 09 '23 at 12:17

How do I use the local Firebase Auth emulator and not production auth to test my users?

1 Answers1