92% confidence\u2191 20

CORS policy: No 'Access-Control-Allow-Origin' header

Full error message
Access to fetch at 'https://api.example.com' from origin 'http://localhost:3000' has been blocked by CORS policy
Solution

CORS must be configured on the **server**, not the browser. - Express: `app.use(cors({ origin: 'http://localhost:3000' }))` - FastAPI: `app.add_middleware(CORSMiddleware, allow_origins=[...])` - In development you can proxy the API through your dev server. A browser extension that disables CORS is NOT a fix.

API access

Get this solution programmatically \u2014 free, no authentication.

curl https://depscope.dev/api/error/480ea4ee846f1b7bd1af520beea4f78438234025f1d41a34d91c066b2afd52d0
hash \u00b7 480ea4ee846f1b7bd1af520beea4f78438234025f1d41a34d91c066b2afd52d0
CORS policy: No 'Access-Control-Allow-Origin' header — DepScope fix | DepScope