Browse categories
Explore
Fiverr Pro
English
$
USD
I will fix react, nodejs, and javascript bugs in your mern stack application
Zain
About this gig
Are you looking for a MERN stack developer to fix bugs in your React, Node.js, JavaScript, or MongoDB application fast and professionally? Whether it's a simple React bug fix or a complex full stack debugging task across your entire MERN stack web application you are in the right place.
I specialize in MERN stack web application debugging using React.js, Node.js, Express.js, and MongoDB. From simple JavaScript errors to complex API failures and deployment crashes, I identify the root cause and deliver clean production-ready fixes not temporary patches that break again next week.
What I Fix:
- React component, hook, Redux and Context API bugs
- Node.js and Express.js backend crashes and 500 errors
- MongoDB schema, Mongoose, and query problems
- JavaScript and ES6+ debugging
- REST API errors and integration failures
- JWT authentication and CORS problems
- TypeScript errors and debugging
- Deployment failures and production crashes
Why Clients Choose Me:
- Certified Full Stack and Node.js Developer
- Expert in MERN stack web application debugging
- Proficient in React, Node.js, MongoDB, Express.js, TypeScript
- Fast delivery, clear communication, 100% working code
Whether you need one React bug fixed or y
Get to know Zain
Zain
Full Stack Developer for AI SaaS MVPs Dashboards and Web Apps
- FromPakistan
- Member sinceAug 2025
- Avg. response time1 hour
- Last delivery1 month
Languages
English, Urdu, Hindi, Punjabi
Hi! I'm Zain, a Full Stack MERN Developer specializing in building scalable web applications and fixing bugs across React, Node.js, and MongoDB.
I develop full stack MERN apps, responsive React frontends, Node.js and Express.js backends, REST APIs, and MongoDB databases. I also fix JavaScript bugs, frontend issues, and backend errors in MERN stack projects.
My focus is clean code, fast delivery, and 100% client satisfaction.
Message me before ordering!
My Portfolio
FAQ
Can you fix bugs across the entire MERN stack?
Yes. I handle every layer — React frontend, Node.js backend, Express.js API, and MongoDB database. Whether the bug is on one layer or spread across multiple I identify and fix it completely.
Do you work on production applications safely?
Yes. All fixes follow a production-safe workflow — changes are isolated, tested before delivery, and designed to preserve your existing functionality throughout.
Can you fix deployment failures and crashes?
Yes. Deployment failures, runtime crashes, Express.js errors, MongoDB connection issues, and post-deployment instability are all within scope depending on your package.
Will you test everything before delivering?
Yes. Every fix is tested and verified before delivery to confirm the problem is resolved and nothing else is broken in the process.
What if the problem is not fixed after delivery?
Contact me immediately. I will continue working within the revision scope of your package until the original issue is fully resolved.
What do you need from me before starting?
A description of the bug, your GitHub repository link or relevant source code, error screenshots or console logs, and what the application should do correctly after the fix. Recent code changes or deployments are also helpful but not required to start.
How long does bug fixing take?
Most simple bugs are fixed within 24 hours. Complex full stack issues across multiple layers typically take 2-3 days. Exact timeline depends on your package and the complexity of the problem.
What technologies do you work with?
React.js, Node.js, Express.js, MongoDB, Mongoose, JavaScript, TypeScript, Redux, Context API, Firebase, Socket.io, REST APIs, JWT Auth, Tailwind CSS, Next.js, and Vite. If your stack includes a technology not listed here message me and I will confirm before you order.
