Start with the FCM notification tester
If you already have a Firebase service account JSON file and a device registration token, open the FCM Notification Tester. Upload or paste the JSON, enter the token, title, message, optional data, and send.
Guides
Getting started
Test an FCM notification online
A complete single-device testing workflow.
CredentialsFirebase service account JSON
Generate and protect the private key file used for server authorization.
RegistrationGet an FCM device token
Find the token generated by the Firebase Messaging client SDK.
AuthorizationFCM access token vs device token
Two different tokens with similar names, explained.
Payload & content
FCM HTTP v1 API
Understand OAuth 2.0 authorization and the current send endpoint.
PayloadNotification message vs data message
How each behaves in the foreground and background.
Rich pushSend FCM notifications with images
The notification.image field, and platform differences.
BroadcastFCM topics and multicast
Reach more than one device with topics or a token list.
Platforms & tools
Test FCM on Android, iOS, Flutter and web
One send flow, four platform-specific setup notes.
PostmanSend an FCM notification with Postman
What Postman needs, and a faster alternative.