Allow you to use your keyboard and/or a virtual NES Controller (for touch devices) to control whatever you create, like you would with a NES emulator. All events return a 'pressed' parameter [bool: ...

It's a library that works in both the browser and Node.js. The easiest way to use JSNES in a web page is with jsnes.Browser. It handles canvas rendering, audio, keyboard input, gamepad input, and ...