Claude Code api

Frontend Not Integrated with API Endpoint

Frontend component was built but never connected to the actual API endpoint. The component's action buttons call mock functions or make requests to undefined URLs. Moving to production revealed that the UI flow is orphaned from backend logic.

Frontend was developed in isolation without coordinating with API development, leaving integration gaps.

Error Messages You Might See

TypeError: Cannot read property of undefined POST http://undefined/api/endpoint 404 Not Found Unexpected response structure from API
TypeError: Cannot read property of undefinedPOST http://undefined/api/endpoint 404 Not FoundUnexpected response structure from API

Common Causes

  1. Frontend uses mock API functions instead of real HTTP calls
  2. API endpoint URL is undefined or placeholder string
  3. Frontend expects different data structure than API actually returns
  4. Frontend doesn't handle API errors (404, 500, network failures)
  5. API authentication headers missing from frontend requests

How to Fix It

Replace mock functions with actual HTTP calls (fetch, axios). Define API base URL as environment variable. Match frontend data expectations to actual API response. Add error handling: catch network errors, HTTP errors, show user-friendly messages. Include auth token in request headers: Authorization: Bearer token.

Real developers can help you.

Taufan Taufan I’m a product-focused engineer and tech leader who builds scalable systems and turns ideas into production-ready platforms. Over the past years, I’ve worked across startups and fast-moving teams, leading backend architecture, improving system reliability, and shipping products used by thousands of users. My strength is not just writing code — but connecting product vision, technical execution, and business impact. Victor Denisov Victor Denisov Developer Pratik Pratik SWE with 15+ years of experience building and maintaining web apps and extensive BE infrastructure Yovel Cohen Yovel Cohen I got a lot of experience in building Long-horizon AI Agents in production, Backend apps that scale to millions of users and frontend knowledge as well. Mehdi Ben Haddou Mehdi Ben Haddou - Founder of Chessigma (1M+ users) & many small projects - ex Founding Engineer @Uplane (YC F25) - ex Software Engineer @Amazon and @Booking.com David Olverson David Olverson Solo dev shipping production apps with AI-assisted development. I specialize in rescuing broken Lovable/Bolt/Cursor builds and taking them to production. 10+ apps shipped including SaaS CRMs, gaming platforms, real estate tools, and Discord bots. Stack: Next.js 16, TypeScript, Tailwind CSS, FastAPI, PostgreSQL, Prisma. I use Claude Code with 50+ custom skills for rapid delivery. Average turnaround: 2-4 weeks from broken prototype to production. Stanislav Prigodich Stanislav Prigodich 15+ years building iOS and web apps at startups and enterprise companies. I want to use that experience to help builders ship real products - when something breaks, I'm here to fix it. Tejas Chokhawala Tejas Chokhawala Full-stack engineer with 5 years experience building production web apps using React, Next.js and TypeScript. Focused on performance, clean architecture and shipping fast. Experienced with Supabase/Postgres backends, Stripe billing, and building AI-assisted developer tools. Matthew Butler Matthew Butler Systems Development Engineer @ Amazon Web Services Antriksh Narang Antriksh Narang 5 years+ Experienced Dev (Specially in Web Development), can help in python, javascript, react, next.js and full stack web dev technologies.

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Frequently Asked Questions

How to pass auth tokens in requests?

Set header: Authorization: Bearer {token}. Store token from login response and include in all authenticated requests.

How to handle API errors?

Catch promise rejections. Check response.ok or status code. Display appropriate error messages: 401 = re-auth, 400 = invalid input, 500 = server error.

Should API URL be hardcoded?

No. Use environment variables: const API_URL = process.env.REACT_APP_API_URL. Different URLs for dev/staging/prod.

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