online javascript compiler
// my pick for the top 8 online javascript compilers
https://playcode.io/
https://jsfiddle.net/
https://js.do/
https://jseditor.io/
https://jsbin.com/?html,output
https://repl.it/languages/javascript
https://www.tutorialspoint.com/online_javascript_editor.php
https://paiza.io/en/projects/new?language=javascript