A GUI tool for flashing the Espruino JavaScript runtime on ESP8266 based boards
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Latest commit 7aa0753 Aug 12, 2018



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Flasher.js is a tool to get JavaScript running natively on the Internet of Things device, ESP8266. This application runs on Windows, Mac OS X and Linux.

This tool flashes (installs) the Espruino JavaScript run time on ESP8266 EP-12 devices like the Adafruit Huzzah and Adafruit Feather Huzzah.


The latest realeases can be found here for Windows, Linux and Mac OS X.

Install the required CP2104 USB driver to have the COM/Serial port appear properly.

Application Compatibility

OS Arch Status
Windows 10 32-bit Tested
Windows 10 64-bit Tested
Windows 8.1 64-bit Tested
Ubuntu 14.04 LTS 64-bit Tested
Mac OS X 10.11 64-bit Tested
Mac OS X 10.12 64-bit Tested

Device Compatibility

Flasher.js currently supports ESP8266 (ESP-12) devices for a list of tested devices visit Flasher.js device compatibility page.

Developing Flasher.js

If you want to develop the Flasher.js GUI take a look at the development guide.


We would love your contributions! Check out the contribution guidelines.


Flasher.js is released under the MIT License