medusa-store/docs/content/troubleshooting/cors-issues.md

CORS issues

If you are experiencing connection issues when trying to access your Medusa server from a storefront, it is most likely due to CORS issues.

You might see a log in your browser console, that looks like this:

In your medusa-config.js , you should ensure that you've configured your CORS settings correctly. By default, the Medusa starter runs on port 9000, Medusa Admin runs on port 7000, and the storefront starters run on port 8000.

The default configuration uses the following CORS settings:

// CORS when consuming Medusa from admin
const ADMIN_CORS = process.env.ADMIN_CORS || "http://localhost:7000,http://localhost:7001"

// CORS to avoid issues when consuming Medusa from a client
const STORE_CORS = process.env.STORE_CORS || "http://localhost:8000"

If you wish to run your storefront or Medusa admin on other ports, you should update the above settings accordingly.

Additional Resources

To learn more about CORS configurations, check out the Configure your Server documentation.