Access to XMLHttpRequest at 'http://localhost:3000/socket.io/?EIO=4&transport=polling&t=OLZ_vld' from origin 'null' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

[tskxz]

Im getting these errors

My server.js

const io = require('socket.io')(3000)

io.on('connection', socket => {
    socket.emit('chat-message', 'Hello World')
})

My script.js

const socket = io('http://localhost:3000')
socket.on('chat-message', data => {
    console.log(data)
})

[tskxz]

Fixed it as #2

server.js

const io = require('socket.io')(3000, { cors: { origin: true } })