p5.js empty example sketch with a basic node http server to run the sketch
Alternative: p5-cli - it also contains p5.js libraries https://www.npmjs.com/package/p5-cli
or http-server - A zero-configuration command-line http server (p5.js are not included) https://www.npmjs.com/package/http-server
or live-server - live reloading https://github.com/tapio/live-server