Cursor
api
API Route Returns 404 After Refactoring
An API endpoint that was working correctly now returns 404 Not Found errors after Cursor refactored your route definitions. The route is no longer accessible even though the handler exists.
Route registration or path may have been broken during the refactoring.
Error Messages You Might See
404 Not Found
Cannot GET /api/endpoint
Route is not registered
Path not found
Common Causes
- Route path changed or typo introduced in endpoint URL
- Route handler file moved but import not updated
- Router not mounted to app or removed from main server file
- Route method changed (GET to POST) without updating client
- Route registered after 404 catch-all middleware
How to Fix It
Verify route is mounted: app.use('/api', routes). Check full path: app.get('/api/users') vs router.get('/users'). Verify route HTTP method matches client. Place routes before 404 handler. Log all registered routes: app._router.stack.forEach().
Real developers can help you.
Vlad Temian
15+ years shipping production infrastructure for startups. Former CTO at qed.builders (acquired by The Sandbox).
Cursor ambassador and agentic tooling builder.
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Matthew Butler
Systems Development Engineer @ Amazon Web Services
Franck Plazanet
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Jaime Orts-Caroff
I'm a Senior Android developer, open to work in various fields
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.
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I've been working at a large software company named Kainos for 2 years, and mainly specialise in Platform Engineering. I regularly enjoy working on software products outside of work, and I'm a huge fan of game development using Unity. I personally enjoy Python & C# in my spare time, but I also specialise in multiple different platform-related technologies from my day job.
Mehdi Ben Haddou
- Founder of Chessigma (1M+ users) & many small projects
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Anthony Akpan
Developer with 8 years of experience building softwares fro startups
Jacek Rozanski
Senior PHP/Symfony developer and DevOps engineer with 20+ years of professional experience, running opcode.pl (web development agency, est. 2004).
Day job: I'm the sole backend developer at merketing company where I own and maintain 11 PHP/Symfony microservices on AWS (ECS Fargate, RDS, S3, CloudFront), handle the full CI/CD pipeline (Bitbucket Pipelines, Docker), and manage monitoring with Sentry and CloudWatch. These services handle high request volumes in production every month.
What I bring to AI-built apps:
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Pratik
SWE with 15+ years of experience building and maintaining web apps and extensive BE infrastructure
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Get HelpFrequently Asked Questions
How do I debug route issues?
Log all routes on startup. Use middleware to log every request. Check that full path is correct (include /api prefix).
What's route parameter vs query?
Parameter: /users/:id (in path). Query: /users?sort=name (in URL). Use req.params vs req.query.