How to secure socket.io from outside connections as much as possible?

Question

Node.js

How can I secure the io socket as much as possible from outside connections? That is, so that dofiga smart users could not connect to the socket, and access was only when connecting from the site.

Answer 1

no way

Answer 2

As an option, send something to the server, which will allow you to check if the user is authorized or not.
Customer

let socket = new io("http://localhost:7777", { query: "id=123" });

Server

io.on("connection", socket => {
    let id = socket.handshake.query.id;
    console.log(id) // 123
})

Sample project: https://github.com/space2pacman/pacman-chat