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.

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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.

Related Claude Code Issues

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