From Phaser Tutorials.com: "In Part 1 of this tutorial, we created our Node.js server, set up a basic Phaser game, and set up our server to run Phaser in headless mode. If you missed the beginning, you can find it here. In this tutorial, we are going to focus on adding the Socket.IO library to game, adding the server logic for adding and removing players from the game, and adding the client side logic for adding a player to the game.
If you didn’t complete Part 1 and would like to continue from there, you can find the code for it here. Let’s get started!"