I will fix nodejs express API bugs 500 errors, routes, middleware, auth

B
beatrice_efron
B
beatrice_efron
Beatrice
fix nodejs express API bugs 500 errors, routes, middleware, auth
Full Screen
fix nodejs express API bugs 500 errors, routes, middleware, auth
Full Screen
Full Screen
fix nodejs express API bugs 500 errors, routes, middleware, authfix nodejs express API bugs 500 errors, routes, middleware, authfix nodejs express API bugs 500 errors, routes, middleware, auth

About this gig

Are you getting 500 errors, broken routes, failing middleware, or authentication issues in your Node.js/Express API?

I will debug and fix your backend professionally, explain what caused the issue, and apply clean fixes that keep your API stable.


What I can help you fix

  • 500/400 errors, server crashes, unhandled promise rejections
  • Broken routes/controllers/middleware
  • JWT auth issues (tokens, roles, refresh token logic)
  • CORS, cookies, sessions, headers
  • MongoDB/Mongoose problems (schema, queries, populate, validation)
  • API response issues, validation errors, status codes
  • Environment/config issues (.env, ports, production vs local)
  • Deployment-related API issues (common Express runtime problems)


What you'll get

  • The bug(s) fixed in your codebase
  • Clear notes on what was wrong + what I changed
  • Basic guidance to prevent it happening again


If you're not sure whats wrong, message me with the error and Ill tell you the best package.

  • Platform

    • Custom

  • Website type

    • E-Commerce store
    • Business
    • Landing page
    • Blog
    • Education

  • Programming language

    • JavaScript
    • TypeScript
    • HTML & CSS
    • Bootstrap
    • React
    • Laravel
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 Beatrice

Beatrice

Website Developer

  • FromUnited Kingdom
  • Member sinceApr 2026
  • Avg. response time1 hour

  • Languages

    English
I am a dedicated and results-driven website developer with a passion for creating responsive, user-friendly, and visually engaging digital experiences. I specialize in building modern websites that combine clean design with efficient functionality, ensuring both performance and usability. With a strong foundation in front-end and back-end development, I work with technologies such as HTML, CSS, JavaScript, and various frameworks to deliver scalable and maintainable solutions. I enjoy transforming ideas into fully functional websites, whether it’s a simple landing page or a complex one

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