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I will fix react, nodejs, and javascript bugs in your mern stack application
Zain
About this gig
Need a MERN stack bug fix expert? I will fix React bugs, Node.js errors, JavaScript issues, Express.js API errors, and MongoDB problems fast and professionally.
WHAT I FIX:
React and Frontend Bug Fix
- React component, hook, Redux and Context API bugs
- CSS layout, responsiveness and Tailwind CSS issues
- White screen errors, React Router and memory leaks
Node.js and Backend Bug Fix
- Express.js crashes, 500 errors and REST API issues
- JWT authentication, CORS and middleware problems
- Async, Promise and callback chain bugs
MongoDB and Database Bug Fix
- Schema validation, Mongoose and connection errors
- Slow queries and data not saving correctly
JavaScript Debugging
- ES6+ errors, undefined references and logic bugs
- Third party library and API integration issues
MY PROCESS:
You share code and error details. I identify root cause, fix with clean documented code, test thoroughly and deliver with full explanation. Free revisions until resolved.
WHY CHOOSE ME:
- Most bugs fixed within 24 hours
- Clean professional fixes, no quick patches
- Certified Full Stack and Node.js Developer
- 100% satisfaction guaranteed
Message me first for a free bug assessment!
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 Zain
Zain
Full Stack Developer for AI SaaS MVPs Dashboards and Web Apps
- FromPakistan
- Member sinceAug 2025
- Avg. response time1 hour
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
What information do you need to fix my bug?
Please share the bug description or error message, relevant code or GitHub link, and your tech stack details.More details means faster fixing.
How long does bug fixing take?
Most simple bugs are fixed within 24 hours. Complex full stack bugs take 2 to 3 days. I always communicate if more time is needed.
What if my bug is not fixed after delivery?
I offer free revisions until the issue is 100% resolved. Your satisfaction is my top priority.
Can you access my private GitHub repository?
Yes. I work with private GitHub, GitLab, and Bitbucket repositories. All code is kept strictly confidential and I can sign an NDA if required.
What technologies do you work with?
I work with MongoDB, Express.js, React.js, Node.js, JavaScript ES6+, Tailwind CSS, Redux, Firebase, JWT, REST APIs, and deployment on Vercel, Heroku, and Render.
