v0
auth
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
Missing CLERK_SECRET_KEY
Missing CLERK_PUBLISHABLE_KEY
Cannot authenticate with Clerk
[Clerk] Missing required environment variable
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.
Caio Rodrigues
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My goal is always to deliver solutions that are **simple, efficient, and genuinely useful for the people using them.**
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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.
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Mehdi Ben Haddou
- Founder of Chessigma (1M+ users) & many small projects
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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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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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SWE with 15+ years of experience building and maintaining web apps and extensive BE infrastructure
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.
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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.
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JavaScript (React.js, React Native, Node.js) Developer with demonstrated industry experience of 4+ years, actively looking for opportunities to hone my skills as well as help small-scale business owners with solutions to technical problems
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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.