Lovable
deployment
CORS Error in Production Blocking Supabase Requests
API requests to Supabase fail with CORS error in production. 'Access-Control-Allow-Origin' header missing or not matching domain. Works locally but fails on deployed site.
CORS policy requires server to explicitly allow requests from client domain. Browser blocks cross-origin requests without proper headers.
Error Messages You Might See
Access-Control-Allow-Origin header is missing
CORS policy blocked request
The value of the Access-Control-Allow-Origin is not a match
Common Causes
- Supabase project not configured to allow production domain
- Using wrong domain in CORS settings (www vs non-www)
- Production domain not in Supabase allowed origins list
- Missing API key or using wrong key tier
- localhost still in allowed origins blocking production domain
How to Fix It
In Supabase dashboard > Project Settings > API > CORS config, add your production domain:
https://yourdomain.com
https://www.yourdomain.com
http://localhost:5173Use exact domains. Wildcards not allowed. Redeploy after updating.
Real developers can help you.
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.
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.
Jared Hasson
Full time lead founding dev at a cyber security saas startup, with 10 yoe and a bachelor's in CS. Building & debugging software products is what I've spent my time on for forever
legrab
I'll fill this later
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.
Matthew Jordan
I've been working at a large software company named Kainos for 2 years, and mainly specialise in Platform Engineering. I regularly enjoy working on software products outside of work, and I'm a huge fan of game development using Unity. I personally enjoy Python & C# in my spare time, but I also specialise in multiple different platform-related technologies from my day job.
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.
PawelPloszaj
I'm fronted developer with 10+ years of experience with big projects. I have small backend background too
Taufan
I’m a product-focused engineer and tech leader who builds scalable systems and turns ideas into production-ready platforms.
Over the past years, I’ve worked across startups and fast-moving teams, leading backend architecture, improving system reliability, and shipping products used by thousands of users. My strength is not just writing code — but connecting product vision, technical execution, and business impact.
Daniel Vázquez
Software Engineer with over 10 years of experience on Startups, Government, big tech industry & consulting.
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
Do I need CORS in development?
No, Supabase allows localhost origins by default. Only needed for production domains.
Should I use wildcard CORS?
No, specify exact domains for security. Supabase does not support wildcard origins.