Bolt
database
Firebase Auth Not Initializing - Authentication Fails
Firebase authentication never initializes. Login and signup endpoints return errors. The Firebase console shows requests aren't being received.
Common signs: 'Firebase app not initialized', 'auth/invalid-api-key', or auth always returns null.
Error Messages You Might See
Error: Firebase API Key not valid. Please pass a valid API key.
Error: auth/invalid-api-key
Error: Firebase app named "[DEFAULT]" already exists
Common Causes
- Firebase config not loaded or contains wrong project ID
- Firebase credentials missing or invalid API key
- Web API not enabled in Firebase console
- Firebase initialized after first auth call
- CORS policy blocking Firebase domain
How to Fix It
Verify Firebase config in environment: const config = { apiKey: process.env.NEXT_PUBLIC_FIREBASE_API_KEY, ... }
Initialize Firebase before any auth calls: firebase.initializeApp(config) at app startup
Check Firebase console: Authentications > Providers enabled, Security > API restrictions allow your domain
Real developers can help you.
Taufan
I’m a product-focused engineer and tech leader who builds scalable systems and turns ideas into production-ready platforms.
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Krishna Sai Kuncha
Experienced Professional Full stack Developer with 8+ years of experience across react, python, js, ts, golang and react-native. Developed inhouse websearch tooling for AI before websearch was solved : )
Richard McSorley
Full-Stack Software Engineer with 8+ years building high-performance applications for enterprise clients. Shipped production systems at Walmart (4,000+ stores), Cigna (20M+ users), and Arkansas Blue Cross. 5 patents in retail/supply chain tech. Currently focused on AI integrations, automation tools, and TypeScript-first architectures.
Matthew Butler
Systems Development Engineer @ Amazon Web Services
Rudra Bhikadiya
I build and fix web apps across Next.js, Node.js, and DBs.
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As a Product Engineer at Klasio, I contributed to end-to-end product development, focusing on scalability, performance, and user experience.
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I work on monoliths and microservices, backends and frontends, manage K8s clusters and love to design apps architecture
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I'm a Senior Android developer, open to work in various fields
Alvin Voo
I’ve watched the tech landscape evolve over the last decade—from the structured days of Java Server Pages to the current "wild west" of Agentic-driven development. While AI can "vibe" a frontend into existence, I specialize in the architecture that keeps it from collapsing.
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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
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
Should Firebase config be public?
Yes, firebase config is meant to be public. Never commit actual API keys - use NEXT_PUBLIC_ env vars
How do I enable sign-in methods in Firebase?
Firebase Console > Authentication > Sign-in method > Enable Email/Password, Google, GitHub etc.
Why does Firebase auth work locally but not deployed?
Check that NEXT_PUBLIC_FIREBASE_* env vars are set in deployment config and match your Firebase project