Simple remote monitoring and debugging middleware for is a module for Node.js that runs as a telnet server, giving a remote client control of and information about sockets connected to an instance of

This makes it possible to disconnect, emit, or broadcast data to sockets in a remote terminal without interrupting the Node.js process running also provides a real-time display of any data attached to a socket with the socket#monitor method.


$ npm install


var socketio = require('')(server),
    monitorio = require('');

socketio.use(monitorio({ port: 8000 }));
// started on port 8000

Use telnet to connect to and control a real-time list of sockets connected to

$ telnet 8000

Use hjkl to scroll verticall/horizontally through the list of sockets, e to emit data to a specific socket, and b to broadcast data to all sockets.



Enable to prevent connections from any IP except Defaults to false.

To run safely in production, enable localOnly and access it via telnet via an ssh connection to your box.


The port number for the telnet server to listen on.


Disable to run in the current terminal window, without starting a telnet server. Defaults to true.

Monitoring attaches a method named monitor to every socket object. This method attaches data to a socket and tells to render this data in the terminal window.

Here is an example of how to attach the time that a socket connected to

io.on('connection', function(socket) {

socket#monitor must be called whenever monitored information changes, such as the score of a player in a real-time game, to force a rerender in the window.

socket.on('newHighScore', function(msg) {
  var score = msg.score;
  socket.monitor('highScore', msg.score);

The monitor method also accepts an object, and will display every key-value pair in an object.

socket.on('newPlayer', function(msg) {
  var newPlayer = game.createPlayer();
  // every key-value pair in newPlayer will be shown
  // in the terminal window.

Created by @drewblaisdell