Question

        socket.on('data', function(data, socket){
        console.log(socket);
        worker.handle(data, socket);

When I do this, the output is undefined. Why do I get that instead of socket data?
This passes an (undefined) socket to my worker script, which then tries to write to that undefined socket, crashing the server.

Answer 1

Your callback is wrong. socket.on(‘data’) takes a function with just one parameter — the data. Your 2nd parameter is not valid and won’t be called.

You should (IMHO) just be able to refer to your ‘socket’ variable within the context of the callback.