Prevent socket.io spamming sockets

Question

I am making a multiplayer game using socket.io. Here is a part of my server code.

io.on('connection', (socket) => {
    console.log("socket has connected!!")
    socket.on("go", (name) => {
       addPlayer(name);
    })
    
    socket.on("move", (angle) => {
     //do movement stuff
    })
})

Now people are crashing my server by creating spam sockets. They are opening console and typing this code in client:

setInterval(() => {
var socket = io()
socket.emit("go", "haha ugothacked")
},10)

This creates 100 players each second and eventually crashes my server. How do I prevent this. I know you have to use some kind of rate limit. I don't know how to get ip of the socket.

I am using socket.io v4

How do I do this?