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
Common Causes
- Frontend uses mock API functions instead of real HTTP calls
- API endpoint URL is undefined or placeholder string
- Frontend expects different data structure than API actually returns
- Frontend doesn't handle API errors (404, 500, network failures)
- 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.
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Get HelpFrequently 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.