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low.js is a free to use and open sourced port of the JavaScript runtime Node.js with far lower system requirements, allowing it to run on cheap, power-efficient microcontroller boards based on the ESP32-WROVER module. It also runs on Linux based systems as a smaller, faster booting alternative to Node.JS.

For more information on low.js, please visit .

This repository neither includes the ESP32 internals nor the neonious IDE. Thus, most development happens outside of the repository. Thus, see the Change Log for more activity.

First steps

To try out low.js on a PC, try out the chat webserver example in the repository, which you can run with both low.js and Node.js.

To try out low.js on a ESP32-WROVER, try out the examples on our homepage on your own board.

Compile from source

In case the binary distributions do not fit your needs, you can compile from source.

Before compiling, make sure you have the following software installed:

make g++
automake autoconf libtool
python py-pip
npm (if not already installed together with nodejs)

Note: Node.js is only used to transpile the low.js libs from ES6 to ES5. It is only need for the build process. The binary distributions of low.js available on do not include Node.js, of course - this would defeat the purpose.

With this software installed, please install pyyaml with pip:

pip install pyyaml

The compilation itself can be done with these commands:

git clone --recurse-submodules
cd lowjs

low.js is now built in bin and can be called via bin/low.

The lib directory is also required for low to work (it accesses it via path_to_bin/../lib) and must be copied when creating a distribution. When creating a distribution, it might also make sense to strip the binary with the strip command, to save some KB.

Running tests

Please see the lowjs test documentation.

License / Authors / Contributions

We appreciate every person or company who is willing to contribute to low.js and its related products. We will gladly accept any code contribution which helps the cause after an appropriate review. Bug reports and suggestions are also welcome!

low.js, with exception of the adaption for ESP32, is placed under a permisse free license, allowing you to use low.js commercially and even modify it (see LICENSE file for details). The adaption of low.js for ESP32 is not Open Source, but may be used freely with the lowsync flashing tool. low.js is maintained by neonious, the makers of the neonious one microcontroller board.

Contact us

neonious GmbH
Münsterstr. 246
40470 Düsseldorf

TEL +49 211 9241 8187
FAX +49 211 9241 8172

Managing Director / CEO: Thomas Rogg
District Court Düsseldorf, HRB 83086

Node.js is a trademark of Joyent, Inc. ( ESP32 and ESP32-WROVER are products by Espressif Systems ( neonious GmbH is in no way affiliated with these companies.


A port of Node.JS with far lower system requirements. Community version for POSIX systems such as Linux, uClinux or Mac OS X.







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