Clerk Missing Environment Variables Error
Your Clerk integration fails with 'Missing CLERK_SECRET_KEY' or 'Missing CLERK_PUBLISHABLE_KEY' errors. The application won't start or authentication features are unavailable.
Clerk requires both public and secret keys properly set in your environment variables for client and server-side operations.
Error Messages You Might See
Common Causes
- Missing .env.local file in root directory with Clerk keys
- Keys not properly copied from Clerk Dashboard into env file
- CLERK_PUBLISHABLE_KEY only set on server-side, should be in public client env
- CLERK_SECRET_KEY exposed in client-side code or .env file without local suffix
- Environment variables not reloaded after adding new .env.local file
How to Fix It
Get your keys: Log into Clerk Dashboard, go to API Keys section, copy both publishable and secret keys.
Create .env.local: In your project root, create .env.local with:NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY=pk_test_...
CLERK_SECRET_KEY=sk_test_...
Restart dev server: After updating env file, stop and restart npm run dev.
Verify setup: Check Clerk middleware in middleware.ts includes all necessary protected routes.
Real developers can help you.
Luca Liberati
I work on monoliths and microservices, backends and frontends, manage K8s clusters and love to design apps architecture
Matthew Butler
Systems Development Engineer @ Amazon Web Services
Yovel Cohen
I got a lot of experience in building Long-horizon AI Agents in production, Backend apps that scale to millions of users and frontend knowledge as well.
legrab
I'll fill this later
Tejas Chokhawala
Full-stack engineer with 5 years experience building production web apps using React, Next.js and TypeScript.
Focused on performance, clean architecture and shipping fast.
Experienced with Supabase/Postgres backends, Stripe billing, and building AI-assisted developer tools.
Milan Surelia
Milan Surelia is a Mobile App Developer with 5+ years of experience crafting scalable, cross-platform apps at 7Span and Meticha. At 7Span, he engineers feature-rich Flutter apps with smooth performance and modern UI. As the Co-Founder of Meticha, he builds open-source tools and developer-focused products that solve real-world problems.
Expertise:
💡 Developing cross-platform apps using Flutter, Dart, and Jetpack Compose for Android, iOS, and Web.
🖋️ Sharing insights through technical writing, blogging, and open-source contributions.
🤝 Collaborating closely with designers, PMs, and developers to build seamless mobile experiences.
Notable Achievements:
🎯 Revamped the Vepaar app into Vepaar Store & CRM with a 2x performance boost and smoother UX.
🚀 Launched Compose101 — a Jetpack Compose starter kit to speed up Android development.
🌟 Open source contributions on Github & StackOverflow for Flutter & Dart
🎖️ Worked on improving app performance and user experience with smart solutions.
Milan is always happy to connect, work on new ideas, and explore the latest in technology.
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)
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.
prajwalfullstack
Hi Im a full stack developer, a vibe coded MVP to Market ready product, I'm here to help
Anthony Akpan
Developer with 8 years of experience building softwares fro startups
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
Where do I find my Clerk API keys?
In your Clerk Dashboard, click 'API Keys' in the sidebar. Copy the publishable key and secret key.
What's the difference between the two keys?
Publishable key is for client-side (prefix pk_). Secret key is for server-side only (prefix sk_). Never expose secret key.
Why doesn't Vercel see my env vars?
Set the same variables in Vercel project settings under Environment Variables. Redeploy after adding them.