CORS Doctor

by karthik.dasari2001 · Developer Tools

Manifest V3 Free

View in Chrome Web Store Data as of 17 Oct 2026

Offline CORS error analyzer — diagnoses cross-origin issues with actionable fixes

Users

−1 in 30 days

Rating

5.0 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#181K

#151K among extensions

Version

1.0.0

updated 5 Mar 2026

Users

monthly, 8 months

Latest, 17 Oct 2026: 12 usersMove the mouse over the chart for any month

Ratings count

monthly, 8 months

Latest, 17 Oct 2026: 1 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About CORS Doctor

CORS Doctor is a powerful, fully offline DevTools extension that instantly analyzes and explains CORS (Cross-Origin Resource Sharing) errors directly inside your browser. Instead of wasting time searching for vague error messages like “No ‘Access-Control-Allow-Origin’ header present,” CORS Doctor inspects failed network requests, evaluates request and response headers using a deterministic rule engine, and clearly identifies the exact root cause. It provides accurate explanations along with copy-ready fixes for popular backend frameworks with Java, Python, JavaScript Backends and Nginx as well. With zero AI, no cloud calls, and no data tracking, the extension works entirely on your machine—making it secure, fast, and enterprise-friendly. Designed for frontend developers, backend engineers, and DevOps teams, CORS Doctor helps you diagnose, understand, and fix CORS issues in seconds instead of minutes.