Cursor
api
API Response Parsing Fails After Cursor Refactoring
After Cursor refactored your API response handling code, parsing responses fails with errors. The application expects one format but the API is returning another.
Response handling or format expectation was likely changed incorrectly.
Error Messages You Might See
Unexpected token < in JSON at position 0
Cannot read property of undefined
JSON.parse: unexpected end of JSON input
Unexpected response format
Common Causes
- Response parsing removed (missing .json() or JSON.parse())
- Assumed response structure changed, accessing wrong property path
- Error response format changed, not handling error case
- Array vs object confusion (expect array, got object)
- Null/undefined values not handled when accessed
How to Fix It
Verify response format with console.log(response). Parse JSON: const data = await response.json(). Check status code first: if (!response.ok) throw error. Handle null: data?.property || default. Log API response in browser DevTools Network tab.
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Get HelpFrequently Asked Questions
How do I parse JSON?
fetch: response.json(). axios: already parsed. Manual: JSON.parse(string).
How do I handle API errors?
Check response.ok or status. Catch promise rejection. Log response for debugging.