Fix CORS Errors
Diagnose and fix those cryptic Cross-Origin Resource Sharing errors.
5 min|Beginner
BuildQuick WinDeveloper
Prompt Template
I'm getting a CORS error in my browser console. Look at my project and find where my API handles (or doesn't handle) CORS. Check the browser console for the exact error. Fix it by adding the correct Access-Control-Allow-Origin, Access-Control-Allow-Methods, and Access-Control-Allow-Headers. Handle preflight OPTIONS requests. Do NOT just set Allow-Origin to '*' in production. Use the specific origin of my frontend.
The constraint against wildcard origins in production prevents the most common CORS "fix" that creates security holes.
When your frontend can't talk to your API and the console shows a CORS error.