Push Notifications in React Native + Node.js: The Complete Setup Guide (Part 1)

A developer's guide to Firebase Cloud Messaging — from zero to production in under 3 minutes What is FCM and Why Should You Care? Firebase Cloud Messaging (FCM) is Google's free service for sending push notifications to Android and iOS devices. The best part? It's completely free — unlimited messages, no credit card required, ever. Before we dive in, here's why you shouldn't build your own notification system: Your DIY Solution With FCM ❌ Can't deliver when app is closed ✅ OS handles delivery ❌ Drains battery with persistent connections ✅ Uses OS push channel ❌ Complex iOS APNs setup ✅ FCM abstracts it ❌ Need to maintain infrastructure ✅ Google's global network How It Works: The 30-Second Explanation Your backend never talks directly to users' phones. Instead: Your Backend → FCM Servers (Google) → User's Device (sends) (routes) (receives) FCM uses a device token — a unique string representing one app install on one device — to route messages to the right phone. The Architecture Here's