This is a jumping off point for making a little app with socket communication.
Can be used for p5.js projects too
You need to install both express and socket.io. It should go without saying that this is a node.js project, so you need to have node.js installed on your machine too.
npm install express socket.io
Do your 'frontend work' in the /static/ folder, the set up should be familiar to basic web development (included downloaded p5.js files)
To run the server do node index.js