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.
Bastien Labelle
Full stack dev w/ 20+ years of experience
Rudra Bhikadiya
I build and fix web apps across Next.js, Node.js, and DBs.
Comfortable jumping into messy code, broken APIs, and mysterious bugs.
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AUXLE
I am a Full Stack Developer experienced in building Websites, Web apps and Cross Platform Mobile Apps for Startups and Companies.
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.
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.
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Mehdi Ben Haddou
- Founder of Chessigma (1M+ users) & many small projects
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- ex Software Engineer @Amazon and @Booking.com
Jacek Rozanski
Senior PHP/Symfony developer and DevOps engineer with 20+ years of professional experience, running opcode.pl (web development agency, est. 2004).
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Tech stack: PHP 8.x, Symfony, React, Next.js, PostgreSQL, MySQL, Docker, AWS (ECS, RDS, S3, SQS/SNS, CloudFront), Terraform, Supabase. I also use AI tools daily (Claude Code, Cursor) in my own workflow, so I understand both the strengths and the gaps in AI-generated code.
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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 : )
Costea Adrian
Embedded Engineer specilizing in perception systems. Latest project was a adas camera calibration system.
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)
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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