Go Fiber Firebase Authentication Example

This example demonstrates how to protect Fiber routes with Firebase Authentication by verifying Firebase ID tokens.

Requirements

• A Firebase project with Authentication enabled
• A Google Service Account credential JSON file (download from Firebase Console → Project Settings → Service Accounts)

Setting Up

Copy example.env to .env and set the path to your service account credential file:

GOOGLE_SERVICE_ACCOUNT=path/to/serviceAccountKey.json

Start

go run main.go

Endpoints

Method	Path	Auth required	Description
GET	/salut	No	Public greeting (French)
POST	/ciao	No	Public greeting (Italian)
GET	/salanthe	No	Public greeting (Sinhalese)
GET	/api/hello	Yes	Protected greeting (English)
GET	/api/ayubowan	Yes	Protected greeting with user claims

curl Examples

Public endpoint

curl http://localhost:3001/salut

Protected endpoint — obtain a Firebase ID token first, then:

curl -H "Authorization: Bearer <YOUR_FIREBASE_ID_TOKEN>" \
     http://localhost:3001/api/hello

curl -H "Authorization: Bearer <YOUR_FIREBASE_ID_TOKEN>" \
     http://localhost:3001/api/ayubowan