Не могу подключить socket.io к node.js, что делать?

Question

[Andrew-Marty00shenko]

Access to XMLHttpRequest at 'localhost:3000/socket.io/?EIO=3&transport=polling&...' from origin 'null' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

index.js:83 GET localhost:3000/socket.io/?EIO=3&transport=polling&... net::ERR_FAILED