I recommend 'debugger.html' [1] from Mozilla. "debugger.html is a hackable debugger for modern times, built from the ground up using React and Redux. It is des

I recommend 'debugger.html' [1] from Mozilla. "debugger.html is a hackable debugger for modern times, built from the ground up using React and Redux. It is designed to be approachable, yet powerful. And it is engineered to be predictable, understandable, and testable. Mozilla created this debugger for use in the Firefox Developer Tools." [1] https://github.com/devtools-html/debugger.html https://github.com/devtools-html/debugger.html