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
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.
Mehdi Ben Haddou
- Founder of Chessigma (1M+ users) & many small projects
- ex Founding Engineer @Uplane (YC F25)
- ex Software Engineer @Amazon and @Booking.com
Jen Jacobsen
I’m a Full-Stack Developer with over 10 years of experience building modern web and mobile applications. I enjoy working across the full product lifecycle — turning ideas into real, well-built products that are intuitive for users and scalable for businesses.
I particularly enjoy building mobile apps, modern web platforms, and solving complex technical problems in a way that keeps systems clean, reliable, and easy to maintain.
Nam Tran
10 years as fullstack developer
BurnHavoc
Been around fixing other peoples code for 20 years.
prajwalfullstack
Hi Im a full stack developer, a vibe coded MVP to Market ready product, I'm here to help
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
Stanislav Prigodich
15+ years building iOS and web apps at startups and enterprise companies. I want to use that experience to help builders ship real products - when something breaks, I'm here to fix it.
Luca Liberati
I work on monoliths and microservices, backends and frontends, manage K8s clusters and love to design apps architecture
Caio Rodrigues
I'm a full-stack developer focused on building practical and scalable web applications. My main experience is with **React, TypeScript, and modern frontend architectures**, where I prioritize clean code, component reusability, and maintainable project structures.
I have strong experience working with **dynamic forms, state management (Redux / React Hook Form), and complex data-driven interfaces**. I enjoy solving real-world problems by turning ideas into reliable software that companies can actually use in their daily operations.
Beyond coding, I care about **software quality and architecture**, following best practices for componentization, code organization, and performance optimization.
I'm also comfortable working across the stack when needed, integrating APIs, handling business logic, and helping transform prototypes into production-ready systems.
My goal is always to deliver solutions that are **simple, efficient, and genuinely useful for the people using them.**
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