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: 3.1.2

Current version requires: macOS >= 10.15

Analytics:

Installs (30 days)
runjs 35
Installs (90 days)
runjs 106
Installs (365 days)
runjs 614
Fork me on GitHub