CORS Doctor is an offline Chrome extension designed to analyze and resolve CORS (Cross-Origin Resource Sharing) errors efficiently. It inspects failed network requests and evaluates request and response headers using a deterministic rule engine. This tool provides clear explanations for common CORS issues, eliminating the frustration of vague error messages. Developers can easily copy ready-to-use fixes for various backend frameworks including Java, Python, JavaScript, and Nginx.

This extension operates entirely offline, ensuring data security and speed without relying on AI or cloud services. CORS Doctor is tailored for frontend developers, backend engineers, and DevOps teams, enabling them to quickly diagnose, understand, and rectify CORS issues. By streamlining the troubleshooting process, it significantly reduces the time spent on resolving these common web development challenges.