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.
MFox
Full-stack professional senior engineer (15+years). Extensive experience in software development, qa, and IP networking.
Basel Issmail
’m a Senior Full-Stack Developer and Tech Lead with experience designing and building scalable web platforms. I work across the full development lifecycle, from translating business requirements into technical architecture to delivering reliable production systems.
My work focuses on modern web technologies, including TypeScript, Angular, Node.js, and cloud-based architectures. I enjoy solving complex technical problems and helping teams turn product ideas and prototypes into working platforms that can grow and scale.
In addition to development, I often collaborate closely with product managers, business analysts, designers, and QA teams to ensure that solutions align with both technical and business goals.
I enjoy working with startups and product teams where I can contribute both as a hands-on engineer and as a technical partner in designing and delivering impactful software.
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)
Costea Adrian
Embedded Engineer specilizing in perception systems. Latest project was a adas camera calibration system.
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.
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.
If your project works in theory but not in reality, I help close that gap.
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.
Mehdi Ben Haddou
- Founder of Chessigma (1M+ users) & many small projects
- ex Founding Engineer @Uplane (YC F25)
- ex Software Engineer @Amazon and @Booking.com
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.
Pratik
SWE with 15+ years of experience building and maintaining web apps and extensive BE infrastructure
Describe what's wrong in plain English. No technical knowledge needed.
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.