Firebase Push Notifications in Capacitor Angular Apps: The Complete Implementation Guide

Published: February 16, 2026 Author: Václav Švára Generated with assistance from: Claude (Anthropic AI) Table of Contents Introduction Architecture Overview Prerequisites Firebase Project Setup iOS Configuration The APNs Certificate vs Authentication Key Dilemma Creating APNs Certificates iOS Native Implementation Android Configuration Angular Service Implementation Backend Integration Testing Push Notifications Common Issues and Solutions Production Considerations Conclusion Introduction Push notifications are essential for modern mobile applications, enabling real-time communication with users even when the app isn't running. However, implementing Firebase Cloud Messaging (FCM) in a Capacitor Angular application involves navigating platform-specific requirements, native code integration, and several potential pitfalls. This guide provides a complete, production-ready implementation of Firebase push notifications for Capacitor Angular apps, covering both iOS and Android platforms. Wha