Shameless theft of websocketd, written in javascript.
Why? I needed some looser security. Didn't want to wait. Didn't want to write any Go. And it's like 50 lines of code... Prolly don't handle most edges :-P Please PR.
It works very similar to websocketd. For each new established connection it will spawn a child of the supplied process. Any stdout and stderr from that child will be sendt to the connecting client. And any data sendt from the client will be piped to stdin of the child process.
npm install -g websocketdjs
websocketdjs --port 8080 tail -f /var/log/nginx/access.log
var ws = new WebSocket('ws://localhost:8080/')
ws.onmessage = function(event) { console.log(event.data); }
// --> nginx logs
enjoy.