onMessageReceived(RemoteMessage remoteMessage) not called when app in background or killed

Question

onMessageReceived(RemoteMessage remoteMessage) not called when app in background or killed only showing json string like {"body":"test","title":"test notification}

Answer 1

onMessageReceived() this method of fcm will not trigger when your app is in background or killed mode. In such case system notification tray will generate notification. Here is the link you can see more in detail. Docs

Answer 2

Try to send Data only messages to FCM. It will be triggered all the time. Don't forget to set high priority for the messages!