I will fix nodejs expressjs mysql backend bugs and API errors fast


About this gig
Is your Node.js app crashing? MySQL queries returning wrong data? API throwing 500 errors?
I'll debug your backend, find exactly what's going wrong, and fix it properly so your application runs smoothly without surprises.
What I fix:
- Node.js runtime errors and crashes
- Express.js route, middleware, and controller bugs
- MySQL query errors, wrong results, and slow queries
- REST API errors (400, 401, 403, 404, 500)
- Authentication and session issues
- Database connection and timeout problems
- Data not saving or updating correctly
- CORS errors and request handling issues
- EJS template rendering problems
Why work with me:
- I debug the actual root cause, not just restart the server
- I work with MySQL, Express, Node.js daily on real production projects
- Clear communication I explain what was wrong and how it was fixed
- Revisions included until the issue is fully resolved
How it works:
- Send me your error message, logs, or describe the problem
- Share the relevant code or repository
- I'll fix it and deliver with a clear explanation
Not sure if your issue qualifies? Message me first I'll tell you honestly.
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Get to know Muhammad Sufyan
Full Stack Developer
- FromPakistan
- Member sinceNov 2021
- Avg. response time1 hour
Languages
Urdu, English, Arabic, French
My Portfolio
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FAQ
Do you work with both frontend and backend bugs?
Yes, I handle both frontend (HTML, CSS, JavaScript, React issues) and backend (Node.js, Express, API, server-side logic) bugs.
What information do you need from me? I will need:
Source code or GitHub repository Error message or issue description Hosting/server access (if needed)
Can you fix API or Postman errors?
Yes, I can fix REST API issues, Postman errors, authentication problems (JWT, OAuth), and endpoint bugs.
Will my data and code be safe?
Absolutely. Your code is confidential and will never be shared.
What if the bug cannot be fixed?
I'll tell you upfront after reviewing. I won't take your money if I can't solve it.

