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I will debug and fix node js express rest API errors, backend bugs, plus server issues
Michael J
About this gig
Is your Node.js API failing when your application needs it most? Lets identify the cause and deliver a reliable fix.
Broken Express routes, unexpected 4xx/5xx responses, invalid request handling, and inconsistent JSON output can disrupt features and workflows. Quick patches may hide the cause and cause recurring errors.
I'll review your Node.js and Express code, trace the endpoint, examine routing, middleware, validation, and backend logic, then apply a focused correction suited to your package and scope.
WHAT YOU'LL GET
- Investigation of the agreed API or server-side issue
- A targeted code correction within the selected package
- Checks of the affected endpoint where feasible
- A clear summary of changes and remaining concerns
WHY CHOOSE ME?
I take a methodical, detail-focused approach and communicate findings clearly. I respect your codebase, avoid unnecessary changes, and explain when an issue needs work beyond the agreed scope. My aim is a lasting fix, not a temporary workaround.
Send the error message, relevant logs, endpoint details, and steps to reproduce the issue. Ill review details, clarify scope, and help restore dependable backend functionality for users.
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 Michael J
Michael J
Full Stack Web Developer Next JS Supabase and Stripe Specialist
- FromUnited States
- Member sinceOct 2026
Languages
English, Spanish
I am a full stack engineer With over eight years of elite full stack engineering experience, I specialize in architecting high performance web applications and resolving complex technical bottlenecks. While I am newly arriving on Fiverr today, my professional background spans advanced Next.js development, Supabase database security, Row Level Security debugging, and seamless Stripe payment integrations. If your production deployments are failing or your application suffers from persistent hydration errors, I deliver robust, scalable solutions engineered for immediate business growth.
FAQ
What types of Node.js and Express issues can you fix?
I can debug and fix REST API errors, Express routing problems, middleware issues, backend logic bugs, request validation errors, server-side exceptions, and API response problems within the agreed project scope.
Can you fix REST API endpoints that return 404, 401, 403, or 500 errors?
Yes. I can investigate the root cause of endpoint failures, authentication issues, permission errors, server exceptions, and routing problems to restore proper API functionality.
Do you work on existing Node.js and Express projects?
Yes. This gig is specifically for debugging and improving existing Node.js and Express applications rather than building an application from scratch.
Can you optimize slow or inefficient API endpoints?
Yes. If the issue is related to inefficient backend logic, database queries, or request handling, I can identify bottlenecks and improve the endpoint's performance within the project scope.
What information do you need before starting?
Please provide a description of the issue, the affected API endpoint, error messages, logs, screenshots if available, and the steps required to reproduce the problem. Never share passwords, secret keys, or sensitive credentials.
Will you review my backend code before making changes?
Yes. I first analyze the relevant code, identify the root cause, explain the issue when necessary, and then implement the most appropriate solution instead of applying random fixes.
What happens if my issue is more complex than the selected package?
If the investigation reveals that the issue extends beyond the selected package, I'll explain the findings, discuss the additional scope with you, and only proceed after we agree on the next steps.
