CORS for BigCommerce API: What Works and What Doesn't
If you try to call the BigCommerce REST Management API directly from browser JavaScript, you’re going to hit a wall. Not because your fetch() code is wrong, but because CORS is doing exactly what it’s supposed to do. BigCommerce has multiple API surfaces, and they do not behave the same way from a browser. That distinction matters: Storefront APIs are designed for browser-facing use cases Management APIs are meant for trusted server-side access CORS policy decides whether the browser will even allow your frontend code to read the response That’s the part people usually miss. The request may leave the browser just fine, but if the response doesn’t include the right CORS headers, your app still fails. ...