CORS Blocked with node.js and socket.io

Besides using cors package, I managed to fix it by adding options to the socketio creation. Starting from the version 3 cors config has changed and you have to add these options. Worked on socket version 2.x.x also.

  const io = socketio(httpServer, {
  cors: {
    origin: "http://localhost:3000",
    methods: ["GET", "POST"],
    credentials: true
  }
});

Here is the resource https://socket.io/docs/v3/handling-cors/

Bonus: In case you encounter Bad Request make sure you have the same version of socket.io for the client and the server.

I managed to solve the problem by using this CORS middle ware someone recommended me and checking my firewall settings. https://www.npmjs.com/package/cors