Credential implementation provided to initializeApp() via the "credential" property failed to fetch a valid Google OAuth2

Question

I have a NodeJS Firebase Function that uses firebase-admin sdk. It has been working alright since last year. In the last 2 weeks, the following error started showing in the log:

Credential implementation provided to initializeApp() via the "credential" property failed to fetch a valid Google OAuth2 access token with the following error: "Error fetching access token: 404 page not found

Could it be an issue with the version of "firebase-admin": "^7.3.0" I am using?

Have anyone faced the same issue and can you offer some direction on what might have been the cause?

Bandit

What version of NodeJS are you running? If you're using the Node.js 8 version is deprecated and this may be the reason of why you're getting this error. I suggest you to upgrade to a higher version. – Dixiedixieland

You were right. The issue was with my NodeJS v8. Upgraded to node 10 works well for me. – Bandit

Here is a suggested answer for this questions: Suggested Answer – Squiffy

Answer 1

This looks like a problem with NodeJS, the version 8 is no longer supported as per the documentation. Deployment of functions to the Node.js 8 runtime was disabled in the Firebase CLI on December 15, 2020 and that is most likely why you are facing the 404 error.

To migrate to a newer supported version of the NodeJS runtime, use the documentation.

Also, I do not suspect any issue with your firebase-admin version 7.3.0.

Krystinakrystle

You were right. The issue was with my NodeJS v8. Upgraded to node 10 works well for me. – Bandit

That's great! Thanks for accepting the answer. Please upvote it also. – Krystinakrystle

Answer 2

I have the same error, but I was already on Node 12. Also, the function was running well for years and now is crashing due to this :/

The only solution that worked for me was to change auth to admin from default to explicit passing of service-account.json like is described here in docs https://firebase.google.com/docs/reference/admin/node/admin.credential#cert

Blanchard

This link no longer works, do you have an example of this? I'm running into the same issue as you, Node 12 – Flocculate

Answer 3

For those who are deploying to Google Cloud Functions, requirements:

• Node >= 10

Initialisation:

const functions = require('firebase-functions');
const admin = require('firebase-admin');

admin.initializeApp();

Nitpicking

Answer 4

I had a similar issue. Node > 10

In my case, the error appears sometimes and not often - the reason I found is doing a bulk operation asynchronously. After adding await the calls became synchronous and this issue disappeared.

Irritant