---
title: "I Will fix JavaScript, React, Node.js and Next.js bugs"
url: https://zinnhub.com/zinns/i-will-fix-javascript-react-node-js-and-next-js-bugs/
description: "I fix bugs in web apps and sites: broken forms and buttons, broken login, layout that fell apart, console errors, a project that stopped building after an update. Stack: JavaScript, TypeScript, Node.js on the server, React and Next.js on the front end, plus plain HTML/CSS/JS and WordPress, including theme and plugin PHP. Not Shopify. I also work with code that was written in a hurry or generated with AI tools."
published: 2026-09-29T09:59:29+00:00
modified: 2026-09-30T08:13:33+00:00
language: en-GB
---

# I Will fix JavaScript, React, Node.js and Next.js bugs

If your original developer has moved on, or you just need the broken part working again without paying for a rebuild, start here. I’ve been in IT for 10+ years. I change only what the fix needs, so the rest of your code stays as it was.

Starter fixes one reproducible problem and tells you the cause. Standard takes up to 3 and adds a written summary of what was wrong and what changed. Advanced goes to 5, keeps the summary, and lists the other problems I noticed while I was inside the project. If a problem doesn’t reproduce from your steps, or the fix turns out bigger than the tier, I say so before starting rather than run over.

Stack: JavaScript and TypeScript, React and Next.js on the front end, Node.js on the server, plain HTML/CSS/JS, and WordPress. Not Shopify. Older projects are fine: class-component React, the Next.js Pages Router, older Node versions. If a fix needs a version upgrade, I say so before touching it. On WordPress I fix theme and plugin conflicts, errors in theme or plugin PHP, and sites that broke after an update. If the cause sits in WordPress core or someone else’s plugin, I don’t patch it there: I work around it in your theme or a small custom plugin, and if that isn’t possible, I tell you before I start.

What I need from you: repository access or a project archive, and the steps to reproduce the problem: what you click, what you expect, what happens instead. A staging URL helps; for a live-site fix, add deploy access too. Any access you give me is used only for this fix, and I’m fine signing an NDA.

The fix is yours: however it’s delivered, you get every changed line to review. After delivery, I fix anything that doesn’t work as we agreed, free of charge.

Everything runs in writing. On multi-day work you get a written update at the end of each day, and I answer fast. No calls.

Steps for completing your project
1. Reproduce it first – I reproduce the problem from your steps before changing anything. If it does not reproduce, or turns out bigger than the tier, I tell you the same day and we decide before the clock runs.
2. Find the cause – I read the code path behind the symptom and isolate the actual cause, not just the line that throws. You get it in writing: what is wrong and why.
3. Fix and verify – The fix, then your steps again and the project’s own tests. Other problems I notice on the way get listed, not silently patched.
4. Deliver the way you chose – A pull request in your repository, a patch file, or the fix applied to your live site. Standard and Advanced add the written summary of what changed.
5. Written handover – A short note per bug: the cause, the change, and how to check it yourself. On multi-day work you had a written update each working day.