Paste a browser CORS message and describe the request to get a focused explanation and server-side fix checklist.
Results will appear here.
How to use the CORS Error Explainer
Enter the requested data, run the analysis, and review the result before applying it. All calculations and parsing stay in your browser.
Frequently Asked Questions
What does the CORS Error Explainer do?
Paste a browser CORS message and describe the request to get a focused explanation and server-side fix checklist.
Does this tool upload my data?
No. Processing happens locally in your browser.
Can I use the result in production?
Use it as a practical diagnostic or starting point, then verify important changes in your own environment.
Does it work on mobile?
Yes. The interface adapts to phone and desktop screens.