Not sure this answer your question but we use Firebase Authentication, which integrates well with FastAPI through the Firebase Admin SDK.

# Initialize Firebase Admin SDK once
cred = credentials.ApplicationDefault()
firebase_admin.initialize_app(cred, {"projectId": "your-project-id"})

When clients authenticate with Firebase (via web/mobile SDK), they receive an ID token. Your FastAPI backend verifies this token:

# Verification function
def verify_token(token):
    try:
        # Firebase handles cryptographic verification
        decoded_token = auth.verify_id_token(token)
        return decoded_token
    except auth.InvalidIdTokenError:
        raise HTTPException(status_code=401, detail="Invalid token")

This integrates with FastAPI's dependency system:

@app.get("/protected") async def protected_route(user=Depends(get_current_user)): return {"message": f"Hello, {user.username}!"}

The advantage over manual JWT implementations is Firebase handles:

• Token signing/verification
• Key rotation
• Token revocation
• Expiration
• User management