What OS do you have? There is https://github.com/espruino/BangleApps/blob/master/bin/apploader.js but this uses Node.js's 'noble' module for BLE, which isn't great on Windows.
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
What OS do you have? There is https://github.com/espruino/BangleApps/blob/master/bin/apploader.js but this uses Node.js's 'noble' module for BLE, which isn't great on Windows.