I will debug and fix express rest API and backend errors

I
iskenderscevik
I
iskenderscevik
Iskender Cevik
debug and fix express rest API and backend errors
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debug and fix express rest API and backend errors

About this gig

I will diagnose and fix one clearly reproducible backend bug in an existing Express, Node.js, NestJS, or Fastify REST API.


This service is suitable for:

- 400/500 response errors

- broken routes or middleware

- validation and error-handling problems

- authentication flow bugs in code you are authorized to share

- database query or API integration defects

- TypeScript build and runtime errors


You will receive a focused source-code fix, basic verification, and concise notes explaining what changed. Please send reproduction steps, the expected and actual result, relevant sanitized source files, and any error logs. Remove passwords, API keys, .env files, private keys, customer data, and production credentials before sharing.


One package covers one reproducible backend issue. Larger refactors, new features, or multiple unrelated bugs require a custom offer.

  • Expertise

    • Debugging
    • Performance
    • Databases
    • Testing procedures

  • Programming language

    • TypeScript

  • Backend framework

    • Express.js
    • Fastify
    • NestJS
    • Node.js

Get to know Iskender Cevik

Iskender Cevik

Node js and TypeScript bug fixes for web apps

  • FromTurkey
  • Member sinceSep 2026

  • Languages

    Turkish
I fix clearly defined bugs in existing JavaScript, TypeScript, and Node js projects. I focus on build errors, runtime exceptions, broken API requests, validation problems, and small logic defects. My deliveries include focused code changes, basic error handling, and concise verification notes. Please share reproduction steps and sanitized source files without passwords, API keys, env files, private keys, or customer data.

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