Online code playground
Scrimba: https://scrimba.com - playground and recording
StackBlitz: https://stackblitz.com
CodeSandbox: https://codesandbox.io
Glitch: http://glitch.com
Replit: http://replit.com
Codeply: https://www.codeply.com
Sololearn: http://sololearn.com
Codepen: https://codepen.io
Jsfiddle: https://jsfiddle.net
Jsbin: https://jsbin.com
Jsitor: https://jsitor.com
Playcode: https://playcode.io
Jseditor: https://jseditor.io
Liveweave: https://liveweave.com
Plunker: http://plnkr.co
Code formatter: Web Formatter
Online Programming compiler
Jdoodle: https://jdoodle.com