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Ultra-lightweight JavaScript engine for the Internet of Things.
C JavaScript C++ Python CMake Shell Other
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zherczeg and dbatyai Fix post increase / decrease in the pre-scanner. (#3430)
Fixes #3397.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg
Latest commit 5ceffd2 Dec 6, 2019
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docs Allow to create ArrayBuffer with empty external user data (#3373) Nov 29, 2019
jerry-core Fix post increase / decrease in the pre-scanner. (#3430) Dec 6, 2019
jerry-debugger Sort function breakpoints before enabling them (#3238) Oct 24, 2019
jerry-ext Introduce jerry_get_resource_name API function (#3236) Nov 6, 2019
jerry-libm Get rid of strict aliasing rule violations from libm (#3069) Oct 1, 2019
jerry-main Make REPL option parser handle "-" option properly (#3384) Nov 29, 2019
jerry-port/default Remove superfluous include (#3198) Oct 3, 2019
targets Update API version to 2.1.0. (#3220) Oct 16, 2019
tests Fix post increase / decrease in the pre-scanner. (#3430) Dec 6, 2019
third-party/valgrind Turn modified fdlibm into Jerry's own libm Apr 8, 2016
tools Make work with python3 too (#3324) Nov 15, 2019
.gitignore Don't let doctests pollute the source tree (#2346) May 20, 2018
.travis.yml Remove ARTIK 053 from the targets. (#3206) Oct 8, 2019
CMakeLists.txt Fix Cygwin build (#3147) Sep 23, 2019 The sample git hook shouldn't duplicate signed-off (#3022) Aug 27, 2019 Add contribution guidelines and DCO. (#1348) Sep 16, 2016
Doxyfile Fix FILE_PATTERNS of Doxyfile and some of the issues it was hiding (#… Aug 13, 2018
LICENSE Update copyright notice in LICENSE and README. (#1446) Nov 25, 2016
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LOGO.svg Add JerryScript logo. Feb 5, 2016 Add Configuration doc to the README (#2988) Jul 25, 2019
appveyor.yml Don't upload artifacts to AppVeyor (#3316) Nov 14, 2019 Fix URLs in the repository after organization switch (#2955) Jul 9, 2019

JerryScript: JavaScript engine for the Internet of Things

License Travis CI Build Status AppVeyor Build Status Coverity Scan Build Status FOSSA Status SonarQube IRC Channel

JerryScript is a lightweight JavaScript engine for resource-constrained devices such as microcontrollers. It can run on devices with less than 64 KB of RAM and less than 200 KB of flash memory.

Key characteristics of JerryScript:

  • Full ECMAScript 5.1 standard compliance
  • 160K binary size when compiled for ARM Thumb-2
  • Heavily optimized for low memory consumption
  • Written in C99 for maximum portability
  • Snapshot support for precompiling JavaScript source code to byte code
  • Mature C API, easy to embed in applications

Additional information can be found on our project page and Wiki.

Memory usage and Binary footprint are measured at here with real target daily.

The following table shows the latest results on the devices:

STM32F4-Discovery Remote Testrunner
Raspberry Pi 2 Remote Testrunner

IRC channel: #jerryscript on freenode Mailing list:, you can subscribe here and access the mailing list archive here.

Quick Start

Getting the sources

git clone
cd jerryscript

Building JerryScript

python tools/

For additional information see Getting Started.



The project can only accept contributions which are licensed under the Apache License 2.0 and are signed according to the JerryScript Developer's Certificate of Origin. For further information please see our Contribution Guidelines.


JerryScript is open source software under the Apache License 2.0. Complete license and copyright information can be found in the source code.

FOSSA Status

Copyright JS Foundation and other contributors,

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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