How to Build a Notification System
Create a multi-channel notification system supporting in-app, email, push, and SMS notifications.
What You'll Learn
This intermediate-level guide walks you through how to build a notification system step by step. Estimated time: 14 min.
Step 1: Design the notification architecture
Define notification types, delivery channels, templates, and user preference management for your system.
Step 2: Build the notification service
Create a centralized service that accepts notification requests, resolves templates, and routes to appropriate delivery channels.
Step 3: Implement in-app notifications
Build a real-time notification feed with read/unread status, grouping, and WebSocket delivery for instant updates.
Step 4: Add email and push channels
Integrate SendGrid for email delivery and Firebase Cloud Messaging for mobile push notifications.
Step 5: Handle user preferences
Build a preferences UI where users control which notifications they receive, on which channels, and how frequently.
Frequently Asked Questions
Should I build or use a notification service?▾
Use Novu, Knock, or OneSignal for faster implementation. Build custom when you need deep product integration or have complex routing logic.
How do I avoid notification fatigue?▾
Implement frequency capping, intelligent batching, quiet hours, and let users control their notification preferences granularly.
How do I handle notification delivery failures?▾
Implement retry with exponential backoff, fallback channels for critical notifications, and tracking of delivery status per channel.