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
Access-Control-Allow-Origin header is missingCORS policy blocked requestThe value of the Access-Control-Allow-Origin is not a match

Common Causes

  1. Supabase project not configured to allow production domain
  2. Using wrong domain in CORS settings (www vs non-www)
  3. Production domain not in Supabase allowed origins list
  4. Missing API key or using wrong key tier
  5. 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:5173

Use exact domains. Wildcards not allowed. Redeploy after updating.

Real developers can help you.

Meïr Ankri Meïr Ankri Full-stack developer specializing in React / Next.js / Node.js with 6+ years of experience. I've worked across various sectors including automotive (Reezocar/Société Générale), healthcare (Medical Link SaaS), and e-commerce (Glasman). I build web apps end-to-end, from architecture to production, with a focus on scalability, performance, and code quality. I also mentor junior developers and contribute to technical decisions and code reviews. BurnHavoc BurnHavoc Been around fixing other peoples code for 20 years. Richard McSorley 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. Kingsley Omage Kingsley Omage Fullstack software engineer passionate about AI Agents, blockchain, LLMs. Simon A. 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. Jaime Orts-Caroff Jaime Orts-Caroff I'm a Senior Android developer, open to work in various fields Daniel Vázquez Daniel Vázquez Software Engineer with over 10 years of experience on Startups, Government, big tech industry & consulting. legrab legrab I'll fill this later Nam Tran Nam Tran 10 years as fullstack developer Jared Hasson 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

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Frequently 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.

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Can't fix it yourself?
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