Bolt
integration
Firebase Push Notifications Failing in Bolt App
Your Bolt.new application is set up with Firebase Cloud Messaging (FCM) for push notifications, but users never receive them. The notification permission prompt may not appear, tokens fail to generate, or notifications are sent from the backend but never arrive on users' devices.
Push notifications are essential for user re-engagement: notifying users about new messages, order updates, price alerts, or time-sensitive events. When they don't work, your app loses its ability to bring users back, and you have to rely entirely on email which has much lower engagement rates.
Firebase push notifications involve multiple moving parts: a service worker on the client, a valid FCM token per device, proper Firebase configuration, and a server-side component that sends the actual notifications. Bolt's AI typically sets up some of these pieces but misses critical configuration steps.
Error Messages You Might See
FirebaseError: Messaging: A problem occurred while subscribing the user to FCM
Error: Service worker registration failed
FirebaseError: Messaging: The notification permission was not granted
messaging/token-subscribe-failed
FirebaseError: Messaging: We are unable to register the default service worker
403 SenderId mismatch
Common Causes
- Service worker not registered — Firebase requires a firebase-messaging-sw.js service worker file in the public root directory, which Bolt may not have created
- Firebase config mismatch — The Firebase configuration in the app doesn't match the project in Firebase Console, so FCM can't authenticate
- Notification permission not requested — The app never calls Notification.requestPermission(), so the browser blocks all notifications
- FCM token not saved — The device token is generated but never sent to your backend for storage, so you can't target the user for notifications
- VAPID key missing — The Voluntary Application Server Identification (VAPID) key is not configured, which is required for web push
- Browser or OS blocking notifications — The user or their OS has disabled notifications globally, and your app doesn't detect or communicate this
How to Fix It
- Create the service worker file — Add firebase-messaging-sw.js to your public folder: importScripts('https://www.gstatic.com/firebasejs/10.7.0/firebase-app-compat.js', 'https://www.gstatic.com/firebasejs/10.7.0/firebase-messaging-compat.js'); firebase.initializeApp({...config}); firebase.messaging();
- Request permission properly — Ask for notification permission with context: show a UI explaining why notifications are useful before calling Notification.requestPermission()
- Generate and save FCM token — After permission is granted: const token = await getToken(messaging, { vapidKey: process.env.NEXT_PUBLIC_FIREBASE_VAPID_KEY }); await saveTokenToBackend(token, userId);
- Configure VAPID key — In Firebase Console > Project Settings > Cloud Messaging, generate a Web Push certificate key pair and use the public key as your VAPID key
- Send from backend with Admin SDK — Use Firebase Admin SDK on the server: admin.messaging().send({ token: userFcmToken, notification: { title: 'New message', body: 'You have a new message' } })
- Handle token refresh — FCM tokens expire and refresh. Listen for token changes: onMessage(messaging, (payload) => handleForegroundMessage(payload))
Real developers can help you.
Simon A.
I'm a backend developer building APIs, emulators, and interactive game systems. Professionally, I've developed Java/Spring reporting solutions, managed relational and NoSQL databases, and implemented CI/CD workflows.
Jared Hasson
Full time lead founding dev at a cyber security saas startup, with 10 yoe and a bachelor's in CS. Building & debugging software products is what I've spent my time on for forever
zipking
I am a technologist and product builder dedicated to creating high-impact solutions at the intersection of AI and specialized markets. Currently, I am focused on PropScan (EstateGuard), an AI-driven SaaS platform tailored for the Japanese real estate industry, and exploring the potential of Archify.
As an INFJ-T, I approach development with a "systems-thinking" mindset—balancing technical precision with a deep understanding of user needs. I particularly enjoy the challenge of architecting Vertical AI SaaS and optimizing Small Language Models (SLMs) to solve specific, real-world business problems. Whether I'm in a CTO-level leadership role or hands-on with the code, I thrive on building tools that turn complex data into actionable value.
David Olverson
Solo dev shipping production apps with AI-assisted development. I specialize in rescuing broken Lovable/Bolt/Cursor builds and taking them to production. 10+ apps shipped including SaaS CRMs, gaming platforms, real estate tools, and Discord bots. Stack: Next.js 16, TypeScript, Tailwind CSS, FastAPI, PostgreSQL, Prisma. I use Claude Code with 50+ custom skills for rapid delivery. Average turnaround: 2-4 weeks from broken prototype to production.
Bastien Labelle
Full stack dev w/ 20+ years of experience
Sage Fulcher
Hey I'm Sage! Im a Boston area software engineer who grew up in South Florida. Ive worked at a ton of cool places like a telehealth kidney care startup that took part in a billion dollar merger (Cricket health/Interwell health), a boutique design agency where I got to work on a ton of exciting startups including a photography education app, a collegiate Esports league and more (Philosophie), a data analytics as a service startup in Cambridge (MA) as well as at Phillips and MIT Lincoln Lab where I designed and developed novel network security visualizations and analytics. I've been writing code and furiously devoted to using computers to make people’s lives easier for about 17 years. My degree is in making computers make pretty lights and sounds. Outside of work I love hip hop, the Celtics, professional wrestling, magic the gathering, photography, drumming, and guitars (both making and playing them)
BurnHavoc
Been around fixing other peoples code for 20 years.
Dor Yaloz
SW engineer with 6+ years of experience,
I worked with React/Node/Python
did projects with React+Capacitor.js for ios
Supabase expert
Matthew Butler
Systems Development Engineer @ Amazon Web Services
Prakash Prajapati
I’m a Senior Python Developer specializing in building secure, scalable, and highly available systems. I work primarily with Python, Django, FastAPI, Docker, PostgreSQL, and modern AI tooling such as PydanticAI, focusing on clean architecture, strong design principles, and reliable DevOps practices. I enjoy solving complex engineering problems and designing systems that are maintainable, resilient, and built to scale.
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
Do Firebase push notifications work on iOS Safari?
Yes, but only since iOS 16.4 and only for apps added to the Home Screen (PWA). Standard Safari doesn't support Web Push. For full iOS support, you need a native app wrapper or use a service like OneSignal that handles the complexity.
Why do notifications work in development but not in production?
Common causes: the firebase-messaging-sw.js file isn't in the production build output, the VAPID key is different between environments, or the Firebase project used in development differs from production. Verify all Firebase config values match your production Firebase project.