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Fiverr Pro
English
$
USD
I will fix your nodejs, expressjs API bugs and backend errors fast
M Ayan
About this gig
Is your Node.js or Express.js API throwing errors, crashing, or returning wrong responses? I will fix it fast clean, permanently, and with a full explanation.
As a Full-Stack MERN Developer, I specialize in diagnosing and resolving complex backend issues that block your project from going live.
WHAT I FIX
Node.js crashes and unhandled exceptions
Express.js routing errors and middleware issues
CORS policy errors blocking your frontend
REST API broken endpoints or wrong responses
JWT authentication and token failures
MongoDB / Mongoose connection and query errors
Deployment errors on Vercel, Render, Railway, Heroku
Fix broken Stripe or third-party API integrations
Node.js memory leaks and performance bottlenecks
500 Internal Server Error diagnosed and resolved
WHAT I NEED FROM YOU
Code via GitHub link or ZIP file
Error screenshots or logs
Node.js version and package.json
WHY CHOOSE ME
Most fixes delivered within 24 hours
Clean, well-commented code no messy patches
Full refund if I cannot fix it zero risk for you
3 days free follow-up support after delivery
I explain exactly what was wrong and what I changed
NDA available on request your code stays private
Respect third-party rights
Please be aware that it is against Fiverr's policies for sellers to include themes, templates, or any other elements that infringe third-party rights or applicable laws in the delivered work. Read more about in our Guide to Responsible Digital Creation.
Get to know M Ayan
M Ayan
Building the Future, One MERN App at Time! Your Vision, My MERN Magic!
- FromPakistan
- Member sinceJun 2023
Languages
Urdu, English
MERN Stack Developer | Bringing Your Vision to Life!
I'm a passionate MERN Stack developer driven by a relentless curiosity to learn and master new technologies. My expertise lies in crafting robust, scalable, and intuitive web applications using MongoDB, Express.js, React, and Node.js. I thrive on real-world challenges, eager to apply my skills to transform your ideas into exceptional digital experiences that truly stand out.
My Portfolio
FAQ
How fast will you fix my bug?
Most simple API bugs are resolved within 24 hours. Complex multi-file issues may take up to 2 days. I will give you an honest timeline after reviewing your code — no guessing.
What if you cannot fix my issue?
You get a full refund — no questions asked. I always review the problem before accepting the order to make sure it is within my expertise.
Do I need to share my entire codebase?
Not always. Often just the relevant files, error logs, and screenshots are enough. I will tell you exactly what I need after you message me.
Will you explain what caused the bug?
Yes. Every delivery includes a short written explanation of what was wrong and what I changed — so you understand the fix and it does not happen again.
Can you fix code written by someone else?
Absolutely. I regularly work on codebases written by other developers. I study the structure first and apply clean, non-disruptive fixes.
Is my code safe and confidential?
100%. I treat all client code with strict confidentiality and never share, reuse, or store it. An NDA is available on request.
What Node.js or Express versions do you support?
I work with all modern versions including Node.js 14, 16, 18, and 20+. CommonJS and ES Module projects are both supported.
