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Supabase Storage Bucket CORS Error on Upload
File upload to Supabase Storage fails with CORS error. 'Access-Control-Allow-Origin' missing in response. Works with API key but not with RLS. Uploads blocked from production domain.
Supabase Storage requires CORS configuration and proper bucket settings for client-side uploads.
Error Messages You Might See
Access-Control-Allow-Origin header is missing
CORS policy does not allow access
No such bucket
Common Causes
- Bucket CORS not configured in Supabase
- Domain not added to allowed origins
- Not using public bucket when needed
- Trying to use private bucket with expired token
- RLS policy blocks upload operation
How to Fix It
Configure CORS in Supabase dashboard > Storage > Buckets > select bucket > CORS policy:
[
{
"origin": ["https://yourdomain.com"],
"methods": ["GET", "POST", "PUT", "DELETE"],
"allowedHeaders": ["*"]
}
]Use signed URLs for private uploads or public bucket for direct uploads.
Real developers can help you.
zipking
I am a technologist and product builder dedicated to creating high-impact solutions at the intersection of AI and specialized markets. Currently, I am focused on PropScan (EstateGuard), an AI-driven SaaS platform tailored for the Japanese real estate industry, and exploring the potential of Archify.
As an INFJ-T, I approach development with a "systems-thinking" mindset—balancing technical precision with a deep understanding of user needs. I particularly enjoy the challenge of architecting Vertical AI SaaS and optimizing Small Language Models (SLMs) to solve specific, real-world business problems. Whether I'm in a CTO-level leadership role or hands-on with the code, I thrive on building tools that turn complex data into actionable value.
Tejas Chokhawala
Full-stack engineer with 5 years experience building production web apps using React, Next.js and TypeScript.
Focused on performance, clean architecture and shipping fast.
Experienced with Supabase/Postgres backends, Stripe billing, and building AI-assisted developer tools.
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
Matthew Butler
Systems Development Engineer @ Amazon Web Services
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.
prajwalfullstack
Hi Im a full stack developer, a vibe coded MVP to Market ready product, I'm here to help
Yovel Cohen
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.
Krishna Sai Kuncha
Experienced Professional Full stack Developer with 8+ years of experience across react, python, js, ts, golang and react-native. Developed inhouse websearch tooling for AI before websearch was solved : )
PawelPloszaj
I'm fronted developer with 10+ years of experience with big projects. I have small backend background too
rayush33
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
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
Should I use public or private bucket?
Public: direct browser uploads with CORS. Private: use signed URLs or server-side uploads.
How long are signed URLs valid?
Configurable from seconds to days. Default is reasonable but set based on your needs.