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Reworked the readme
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Benoit Blanchon
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README.md
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README.md
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---
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[](https://ci.appveyor.com/project/bblanchon/arduinojson/branch/master) [](https://travis-ci.org/bblanchon/ArduinoJson) [](https://coveralls.io/r/bblanchon/ArduinoJson?branch=master) [](https://github.com/bblanchon/ArduinoJson)
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[](https://ci.appveyor.com/project/bblanchon/arduinojson/branch/master) [](https://travis-ci.org/bblanchon/ArduinoJson) [](https://coveralls.io/r/bblanchon/ArduinoJson?branch=master) [](https://github.com/bblanchon/ArduinoJson)
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ArduinoJson is a C++ JSON library for Arduino and IoT (Internet Of Things).
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ArduinoJson - C++ JSON library for IoT
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## Features
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====================
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*An elegant and efficient JSON library for embedded systems.*
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It's designed to have the most intuitive API, the smallest footprint and is able to work without any allocation on the heap (no malloc).
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It has been written with Arduino in mind, but it isn't linked to Arduino libraries so you can use this library in any other C++ project.
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For instance, it supports Aduino's `String` and `Stream`, but also `std::string`, `std::istream` and `std::ostream`.
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Features
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--------
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* JSON decoding (comments are supported)
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* JSON decoding (comments are supported)
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* JSON encoding (with optional indentation)
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* JSON encoding (with optional indentation)
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* Elegant API, very easy to use
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* Elegant API, easy to use
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* Fixed memory allocation (zero malloc)
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* Fixed memory allocation (zero malloc)
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* No data duplication (zero copy)
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* No data duplication (zero copy)
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* Portable (written in C++98)
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* Portable (written in C++98, can be used in any C++ project)
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* Self-contained (no external dependency)
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* Self-contained (no external dependency)
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* Small footprint
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* Small footprint
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* Header-only library
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* Input and output streams
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* MIT License
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* [100% code coverage](https://coveralls.io/github/bblanchon/ArduinoJson)
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* [Header-only library](https://en.wikipedia.org/wiki/Header-only)
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* [MIT License](https://en.wikipedia.org/wiki/MIT_License)
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* [Comprehensive documentation](https://arduinojson.org)
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* [Comprehensive documentation](https://arduinojson.org)
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Works on
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## Compatibility
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--------
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* Arduino boards: Uno, Due, Mini, Micro, Yun...
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ArduinoJson works on the following hardware:
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* ESP8266, ESP32
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* Teensy
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* RedBearLab boards (BLE Nano...)
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* Intel Edison and Galileo
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* WeMos boards: D1...
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* Computers: Windows, Linux, OSX...
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* PlatformIO
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* Particle
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* Energia
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Quick start
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* <img src="https://www.arduino.cc/favicon.ico" height="16" width="16"> Arduino boards: [Uno](https://www.arduino.cc/en/Main/ArduinoBoardUno), [Due](https://www.arduino.cc/en/Main/ArduinoBoardDue), [Mini](https://www.arduino.cc/en/Main/ArduinoBoardMini), [Micro](https://www.arduino.cc/en/Main/ArduinoBoardMicro), [Yun](https://www.arduino.cc/en/Main/ArduinoBoardYun)...
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-----------
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* <img src="http://espressif.com/sites/all/themes/espressif/favicon.ico" height="16" width="16"> Espressif chips: [ESP8266](https://en.wikipedia.org/wiki/ESP8266), [ESP32](https://en.wikipedia.org/wiki/ESP32)
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* <img src="https://www.wemos.cc/themes/martin-materialize-parallax/assets/favicon.ico" height="16" width="16"> WeMos boards: [D1](https://wiki.wemos.cc/products:d1:d1), [D1 mini](https://wiki.wemos.cc/products:d1:d1_mini), ...
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* <img src="http://redbearlab.com/favicon.ico" height="16" width="16"> RedBearLab boards: [BLE Nano](http://redbearlab.com/blenano/), [BLE Mini](http://redbearlab.com/blemini/), [WiFi Micro](https://redbear.cc/product/wifi/wifi-micro.html), [LOLIN32](https://wiki.wemos.cc/products:lolin32:lolin32)...
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* <img src="https://www.pjrc.com/favicon.ico" height="16" width="16"> [Teensy](https://www.pjrc.com/teensy/) boards
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* <img src="https://software.intel.com/sites/all/themes/zero/favicon.ico" height="16" width="16"> Intel boards: Edison, Galileo...
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* <img src="https://www-assets.particle.io/images/favicon.png" height="16" width="16"> Particle boards: [Photon](https://www.particle.io/products/hardware/photon-wifi-dev-kit), [Electron](https://www.particle.io/products/hardware/electron-cellular-dev-kit)...
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* <img src="http://www.ti.com/favicon.ico" height="16" width="16"> Texas Instruments boards: [MSP430](http://www.ti.com/microcontrollers/msp430-ultra-low-power-mcus/overview/overview.html)...
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#### Decoding / Parsing
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ArduinoJson compiles with zero warning on the following compilers, IDEs, and platforms:
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* <img src="https://www.arduino.cc/favicon.ico" height="16" width="16"> [Arduino IDE](https://www.arduino.cc/en/Main/Software)
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* <img src="http://cdn.platformio.org/favicon.ico" height="16" width="16"> [PlatformIO](http://platformio.org/)
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* <img src="http://energia.nu/img/favicon.ico" height="16" width="16"> [Energia](http://energia.nu/)
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* <img src="http://www.visualmicro.com/pics/arduino-visual-studio-ld.png" height="16" width="16"> [Visual Micro](http://www.visualmicro.com/)
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* <img src="http://www.atmel.com/Images/favicon.ico" height="16" width="16"> [Atmel Studio](http://www.atmel.com/microsite/atmel-studio/)
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* <img src="https://www.iar.com/favicon.ico" height="16" width="16"> [IAR Embedded Workbench](https://www.iar.com/iar-embedded-workbench/)
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* <img src="http://www.st.com/etc/clientlibs/st-site/media/app/images/favicon.png" height="16" width="16"> [Atollic TrueSTUDIO](https://atollic.com/truestudio/)
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* <img src="http://www.keil.com/favicon.ico" height="16" width="16"> [Keil uVision](http://www.keil.com/)
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* <img src="http://www.microchip.com/favicon.ico" height="16" width="16"> [MPLAB X IDE](http://www.microchip.com/mplab/mplab-x-ide)
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* <img src="https://gcc.gnu.org/favicon.ico" height="16" width="16"> [GCC](https://gcc.gnu.org/)
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* <img src="https://clang.llvm.org/favicon.ico" height="16" width="16"> [Clang](https://clang.llvm.org/)
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* <img src="https://www.visualstudio.com/favicon.ico" height="16" width="16"> [Visual Studio](https://www.visualstudio.com/)
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## Quickstart
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### Deserialization
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Here is a program that parses a JSON document with ArduinoJson.
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```c++
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```c++
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char json[] = "{\"sensor\":\"gps\",\"time\":1351824120,\"data\":[48.756080,2.302038]}";
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char json[] = "{\"sensor\":\"gps\",\"time\":1351824120,\"data\":[48.756080,2.302038]}";
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double longitude = root["data"][1];
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double longitude = root["data"][1];
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```
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```
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[See JsonParserExample.ino](https://arduinojson.org/example/parser/)
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See the [tutorial on arduinojson.org](http://arduinojson.org/doc/decoding/)
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Use [ArduinoJson Assistant](https://arduinojson.org/assistant/) to compute the buffer size.
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### Serialization
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#### Encoding / Generating
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Here is a program that generates a JSON document with ArduinoJson:
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```c++
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```c++
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StaticJsonBuffer<200> jsonBuffer;
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StaticJsonBuffer<200> jsonBuffer;
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// {"sensor":"gps","time":1351824120,"data":[48.756080,2.302038]}
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// {"sensor":"gps","time":1351824120,"data":[48.756080,2.302038]}
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```
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```
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[See JsonGeneratorExample.ino](https://arduinojson.org/example/generator/)
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See the [tutorial on arduinojson.org](http://arduinojson.org/doc/encoding/)
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Use [ArduinoJson Assistant](https://arduinojson.org/assistant/) to compute the buffer size.
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## Documentation
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The documentation is available on [arduinojson.org](https://arduinojson.org/), here are some shortcuts:
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Documentation
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* The [Examples](https://arduinojson.org/example/) show how to use the library in various situations.
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-------------
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* The [API Reference](https://arduinojson.org/api/) contains the description of each class and function.
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* The [FAQ](https://arduinojson.org/faq/) has the answer to virtually all questions.
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The documentation is available online in the [ArduinoJson Website](https://arduinojson.org/).
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* The [ArduinoJson Assistant](https://arduinojson.org/assistant/) writes programs for you!
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The [ArduinoJson Assistant](https://arduinojson.org/assistant/) helps you get started with the library.
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Donators
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--------
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Special thanks to the following persons and companies who made generous donations to the library author:
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* Robert Murphy <img alt='USA' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1fa-1f1f8.svg' width='18' height='18'>
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* Surge Communications <img alt='USA' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1fa-1f1f8.svg' width='18' height='18'>
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* Alex Scott <img alt='United Kingdom' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1ec-1f1e7.svg' width='18' height='18'>
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* Firepick Services LLC <img alt='USA' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1fa-1f1f8.svg' width='18' height='18'>
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* A B Doodkorte <img alt='Netherlands' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1f3-1f1f1.svg' width='18' height='18'>
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* Scott Smith <img alt='USA' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1fa-1f1f8.svg' width='18' height='18'>
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* Johann Stieger <img alt='Austria' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1e6-1f1f9.svg' width='18' height='18'>
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* Gustavo Donizeti Gini <img alt='Brazil' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1e7-1f1f7.svg' width='18' height='18'>
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* Charles-Henri Hallard <img alt='France' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1eb-1f1f7.svg' width='18' height='18'>
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* Martijn van den Burg <img alt='Netherlands' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1f3-1f1f1.svg' width='18' height='18'>
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* Nick Koumaris <img alt='Greece' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1ec-1f1f7.svg' width='18' height='18'>
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* Jon Williams <img alt='USA' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1fa-1f1f8.svg' width='18' height='18'>
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* Kestutis Liaugminas <img alt='Lithuania' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1f1-1f1f9.svg' width='18' height='18'>
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* Darlington Adibe <img alt='Nigeria' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1f3-1f1ec.svg' width='18' height='18'>
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* Yoeri Kroon <img alt='Netherlands' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1f3-1f1f1.svg' width='18' height='18'>
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* Andrew Melvin <img alt='United Kingdom' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1ec-1f1e7.svg' width='18' height='18'>
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* Doanh Luong <img alt ='Vietnam' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1fb-1f1f3.svg' width='18' height='18'>
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* Christoph Schmidt <img alt='Germany' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1e9-1f1ea.svg' width='18' height='18'>
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* OpenEVSE LLC <img alt='USA' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1fa-1f1f8.svg' width='18' height='18'>
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* Prokhoryatov Alexey <img alt='Russia' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1f7-1f1fa.svg' width='18' height='18'>
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* Google Inc. <img alt='USA' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1fa-1f1f8.svg' width='18' height='18'>
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* Charles Haynes <img alt='Australia' src='https://d1j8pt39hxlh3d.cloudfront.net/development/emojione/2.2/989/2546.svg' width='18' height='18'>
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* Charles Walker <img alt='USA' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1fa-1f1f8.svg' width='18' height='18'>
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* Günther Jehle <img alt='Liechtenstein' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1f1-1f1ee.svg' width='18' height='18'>
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* Patrick Elliott
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* Alexander Wilms <img alt='Germany' src='https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/svg/1f1e9-1f1ea.svg' width='18' height='18'>
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---
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---
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Found this library useful? Please star this project or [help me back with a donation!](https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=donate%40benoitblanchon%2efr&lc=GB&item_name=Benoit%20Blanchon&item_number=Arduino%20JSON¤cy_code=EUR&bn=PP%2dDonationsBF%3abtn_donate_LG%2egif%3aNonHosted) :smile:
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Do you like this library? Please [star this project on GitHub](https://github.com/bblanchon/ArduinoJson/stargazers)!
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