Cursor
ui
Event Listener Added Multiple Times
After Cursor refactored your component code, event listeners are being attached multiple times. Clicking a button fires the handler multiple times, or scroll events fire excessively.
The useEffect cleanup or listener removal logic was broken.
Error Messages You Might See
Handler called multiple times
Double-firing events
Excessive event firing
Memory leak from listeners
Common Causes
- useEffect missing dependency array, adding listener on every render
- Cleanup function not removing listener
- Multiple components mounting, each adding same global listener
- Event delegation not used, multiple listeners for same event
- Component mounting twice in strict mode (React 18)
How to Fix It
useEffect with cleanup: useEffect(() => { window.addEventListener(...); return () => window.removeEventListener(...); }, []). Empty dependency array ensures once per mount. Use event delegation for many items. In dev, React 18 mounts twice intentionally.
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.
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Solo dev shipping production apps with AI-assisted development. I specialize in rescuing broken Lovable/Bolt/Cursor builds and taking them to production. 10+ apps shipped including SaaS CRMs, gaming platforms, real estate tools, and Discord bots. Stack: Next.js 16, TypeScript, Tailwind CSS, FastAPI, PostgreSQL, Prisma. I use Claude Code with 50+ custom skills for rapid delivery. Average turnaround: 2-4 weeks from broken prototype to production.
ISHANTDEEP SINGH
Senior Software Engineer with 7+ years of experience in React, JavaScript, TypeScript, Next.js, and Node.js. I’ve also worked as a tech lead for startups, owning end-to-end technical execution including architecture, development, scaling, and delivery. I bring a strong mix of hands-on coding, product thinking, and technical leadership, and I’m comfortable building products from scratch as well as improving and scaling existing systems.
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Hi Im a full stack developer, a vibe coded MVP to Market ready product, I'm here to help
zipking
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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
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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.
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.
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Get HelpFrequently Asked Questions
Why is my listener firing twice?
Missing cleanup function in useEffect. Or missing dependency array, adding listener on every render.
What's event delegation?
Add one listener to parent, check event.target. Better than adding listener to every child. Reduces memory.