Why this tool exists
FCM testing should be quick. FCM Notification Tester keeps the interface intentionally small: Firebase service account JSON, device token, title, message, optional data, and one send button.
Built for the current FCM API
The send flow uses Firebase Cloud Messaging HTTP v1 authorization rather than the retired legacy static server-key endpoint.
Independence
FCM Notification Tester is an independent developer tool and is not affiliated with, endorsed by, or sponsored by Google or Firebase.