Common Issues
auth
Login or Signup Not Working in My AI App
Users try to log in or create an account but nothing happens, they get an error, or they're stuck in a loop. This is one of the most common issues with AI-generated apps because auth involves multiple moving parts.
Error Messages You Might See
Invalid login credentials
Email not confirmed
User already registered
Failed to fetch
401 Unauthorized
Redirect URI mismatch
Common Causes
- Auth provider (Supabase, Firebase, Auth0) is not properly configured
- Redirect URLs are wrong — the app sends users to the wrong page after login
- Session or token management is broken — users appear logged in but the app doesn't recognize them
- Email confirmation is required but the emails aren't being sent
- Row Level Security (RLS) policies are blocking access to user data
How to Fix It
- Open browser dev tools (F12) and check the Network tab during login — look for failed API calls
- Verify your auth provider's redirect URL matches your actual app URL
- Check if email confirmation is enabled and whether emails are being sent (check spam folder)
- If using Supabase, check RLS policies — they often block legitimate queries
- Make sure your auth provider's API keys are correct in your environment variables
Real developers can help you.
Bastien Labelle
Full stack dev w/ 20+ years of experience
Kingsley Omage
Fullstack software engineer passionate about AI Agents, blockchain, LLMs.
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.
Omar Faruk
As a Product Engineer at Klasio, I contributed to end-to-end product development, focusing on scalability, performance, and user experience.
My work spanned building and refining core features, developing dynamic website templates, integrating secure and reliable payment gateways, and optimizing the overall system architecture.
I played a key role in creating a scalable and maintainable platform to support educators and learners globally.
I'm enthusiastic about embracing new challenges and making meaningful contributions.
Luca Liberati
I work on monoliths and microservices, backends and frontends, manage K8s clusters and love to design apps architecture
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.
hanson1014
Full-stack developer experienced in fixing and deploying AI-generated apps from Lovable, Bolt.new, Cursor, and Replit. I specialize in debugging Supabase integration issues (auth flows, RLS policies, database connections), fixing broken deployments, resolving routing/blank screen problems, and cleaning up messy React/Vite codebases. I also build production apps with the Claude API and have shipped a Mac desktop dev tool (Nexterm from scratch. Based in Hong Kong, fast turnaround.
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.
Pratik
SWE with 15+ years of experience building and maintaining web apps and extensive BE infrastructure
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Get HelpFrequently Asked Questions
Users can sign up but can't log in. What's wrong?
Usually an email confirmation issue — check if your auth provider requires email verification. Also verify that the login redirect URL is correct.
Login works on localhost but not in production. Why?
Your auth provider's redirect URLs probably still point to localhost. Update them to your production domain in the auth provider's dashboard.