Supabase Realtime Subscription Not Updating in Real-Time
Your Supabase realtime subscription doesn't receive updates. Data changes in the database aren't reflected in real-time on connected clients. Subscription listeners don't fire when expected.
Realtime subscriptions fail when realtimeUrl isn't configured, subscriptions aren't properly cleaned up, or database changes bypass triggers (e.g., direct SQL without replication).
Error Messages You Might See
Common Causes
- Replication not enabled for table in Supabase dashboard
- Subscription not properly set up or connected before data changes occur
- Cleanup (unsubscribe) happening too early or not at all, causing memory leaks
- Database changes made with direct SQL, bypassing replication triggers
- Realtime configuration not loading or URL incorrect
How to Fix It
Enable replication: In Supabase dashboard, go to Replication > select table > enable replication. Realtime only works for replicated tables.
Proper subscription: Use on().subscribe() and clean up in useEffect cleanup:const sub = supabase.on('postgres_changes', {...}).subscribe()
return () => sub.unsubscribe()
Verify auth: User must be authenticated or have anon access to table RLS policies for realtime to work.
Test connection: Check Supabase project Status page for realtime service health. Check browser DevTools for WebSocket connection.
Real developers can help you.
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.
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.
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
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.
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.
Pratik
SWE with 15+ years of experience building and maintaining web apps and extensive BE infrastructure
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.
MFox
Full-stack professional senior engineer (15+years). Extensive experience in software development, qa, and IP networking.
Daniel Vázquez
Software Engineer with over 10 years of experience on Startups, Government, big tech industry & consulting.
legrab
I'll fill this later
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
Why isn't replication enabled by default?
For performance. Enable only tables you need realtime for. Unnecessary replication wastes resources.
Should I unsubscribe from realtime?
Yes, always. In React cleanup: return () => subscription.unsubscribe(). Prevents memory leaks and WebSocket zombies.
How do I debug realtime issues?
Check 1) Replication enabled for table 2) User authenticated 3) Table has RLS policy allowing access 4) Changes made with database insert/update, not direct SQL.