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Vercel Serverless Function Timeout - API Routes Taking Too Long
API routes that work fine locally timeout on Vercel. Long-running tasks like file processing, bulk database operations, or external API calls exceed the timeout limit.
Requests return 504 Gateway Timeout and logs show the function was killed.
Error Messages You Might See
504 - Gateway Timeout
FETCH_ERROR: request timeout
Function timeout after 30s
Vercel Serverless Function Error: timed out
Common Causes
- Function execution time exceeds timeout (default 30s, max 60s on Pro)
- Waiting for slow external API calls without timeout
- Database query not optimized or hitting connection limits
- Large file processing happening synchronously
- Missing async/await causing hanging requests
How to Fix It
Upgrade to Vercel Pro for 60s limit (free tier is 30s max)
Add timeout to external calls: fetch(url, { timeout: 10000 })
Use background jobs for long tasks - trigger async processing, return immediately
Optimize DB queries: add indexes, use pagination for large result sets
Consider moving heavy lifting to cron jobs or separate worker services
Real developers can help you.
Milan Surelia
Milan Surelia is a Mobile App Developer with 5+ years of experience crafting scalable, cross-platform apps at 7Span and Meticha. At 7Span, he engineers feature-rich Flutter apps with smooth performance and modern UI. As the Co-Founder of Meticha, he builds open-source tools and developer-focused products that solve real-world problems.
Expertise:
💡 Developing cross-platform apps using Flutter, Dart, and Jetpack Compose for Android, iOS, and Web.
🖋️ Sharing insights through technical writing, blogging, and open-source contributions.
🤝 Collaborating closely with designers, PMs, and developers to build seamless mobile experiences.
Notable Achievements:
🎯 Revamped the Vepaar app into Vepaar Store & CRM with a 2x performance boost and smoother UX.
🚀 Launched Compose101 — a Jetpack Compose starter kit to speed up Android development.
🌟 Open source contributions on Github & StackOverflow for Flutter & Dart
🎖️ Worked on improving app performance and user experience with smart solutions.
Milan is always happy to connect, work on new ideas, and explore the latest in technology.
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.
Jaime Orts-Caroff
I'm a Senior Android developer, open to work in various fields
Matt Butler
Software Engineer @ AWS
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
Bastien Labelle
Full stack dev w/ 20+ years of experience
Prakash Prajapati
I’m a Senior Python Developer specializing in building secure, scalable, and highly available systems. I work primarily with Python, Django, FastAPI, Docker, PostgreSQL, and modern AI tooling such as PydanticAI, focusing on clean architecture, strong design principles, and reliable DevOps practices. I enjoy solving complex engineering problems and designing systems that are maintainable, resilient, and built to scale.
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.
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.
Pratik
SWE with 15+ years of experience building and maintaining web apps and extensive BE infrastructure
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
What's the maximum timeout on Vercel?
Free: 30s. Pro: 60s. Enterprise: up to 5min
How do I handle long-running tasks?
Trigger them asynchronously. Save a job record to DB, return immediately, process in background
Should I wait for all async tasks?
No! Return response to user, then run cleanup/processing. Use background jobs for long tasks