runjs

Install command: 
brew install --cask runjs

Name: RunJS

JavaScript playground that auto-evaluates as code is typed

https://runjs.app/

Cask JSON API: /api/cask/runjs.json

Cask code: runjs.rb on GitHub

Current version: 3.2.1

Requirements: macOS >= 11

Analytics:

Installs (30 days)
runjs 38
Installs (90 days)
runjs 99
Installs (365 days)
runjs 506