MicroPython has a javascript port that uses Emscripten: https://github.com/micropython/micropython/tree/master/ports/javascript https://github.com/micropython/

MicroPython has a javascript port that uses Emscripten: https://github.com/micropython/micropython/tree/master/ports/javascript https://github.com/micropython/micropython/tree/master/ports... But it doesn't provide much more than the basic REPL. You could also try MicroPython on Unicorn, where more of the hardware is simulated in the browser: http://micropython.org/unicorn/ http://micropython.org/unicorn/ https://github.com/micropython/micropython-unicorn https://github.com/micropython/micropython-unicorn The Unicron-MicroPython kernel is quite old but it's still useful for getting a feel for what's possible.