I added debug drawing of the circle collider using the Melon.js game engine and Box2D-WASM.

Live demo: https://8observer8.github.io/webgl10-js/debug-drawer-box2dwasm-melonjs-js/​
GitHub repository: https://https://github.com/8Observer8/debug-drawer-box2dwasm-melonjs-js​

Playgrounds/Sandboxes:

• Replit: https://replit.com/@8Observer8/Debug-drawer-for-Box2D-WASM-using-Melonjs-and-JS
• Plunker: https://plnkr.co/edit/FPE7qRMIWhAhK5M1?preview
• Glitch: https://glitch.com/edit/#!/sudsy-outstanding-marble​