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---
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[](https://www.ardu-badge.com/ArduinoJson/6.18.2)
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[](https://github.com/bblanchon/ArduinoJson/actions?query=workflow%3A%22Continuous+Integration%22+branch%3A6.x)
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[](https://ci.appveyor.com/project/bblanchon/arduinojson/branch/6.x)
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[](https://bugs.chromium.org/p/oss-fuzz/issues/list?sort=-opened&can=1&q=proj:arduinojson)
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[](https://coveralls.io/github/bblanchon/ArduinoJson?branch=6.x)
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[](https://github.com/bblanchon/ArduinoJson/stargazers)
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ArduinoJson is a C++ JSON library for Arduino and IoT (Internet Of Things).
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## Features
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* [JSON deserialization](https://arduinojson.org/v6/api/json/deserializejson/?utm_source=github&utm_medium=readme)
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* [Optionally decodes UTF-16 escape sequences to UTF-8](https://arduinojson.org/v6/api/config/decode_unicode/?utm_source=github&utm_medium=readme)
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* [Optionally stores links to the input buffer (zero-copy)](https://arduinojson.org/v6/api/json/deserializejson/?utm_source=github&utm_medium=readme)
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* [Optionally supports comments in the input](https://arduinojson.org/v6/api/config/enable_comments/?utm_source=github&utm_medium=readme)
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* [Optionally filters the input to keep only desired values](https://arduinojson.org/v6/api/json/deserializejson/?utm_source=github&utm_medium=readme#filtering)
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* Supports single quotes as a string delimiter
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* Compatible with [NDJSON](http://ndjson.org/) and [JSON Lines](https://jsonlines.org/)
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* [JSON serialization](https://arduinojson.org/v6/api/json/serializejson/?utm_source=github&utm_medium=readme)
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* [Can write to a buffer or a stream](https://arduinojson.org/v6/api/json/serializejson/?utm_source=github&utm_medium=readme)
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* [Optionally indents the document (prettified JSON)](https://arduinojson.org/v6/api/json/serializejsonpretty/?utm_source=github&utm_medium=readme)
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* [MessagePack serialization](https://arduinojson.org/v6/api/msgpack/serializemsgpack/?utm_source=github&utm_medium=readme)
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* [MessagePack deserialization](https://arduinojson.org/v6/api/msgpack/deserializemsgpack/?utm_source=github&utm_medium=readme)
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* Efficient
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* [Twice smaller than the "official" Arduino_JSON library](https://arduinojson.org/2019/11/19/arduinojson-vs-arduino_json/?utm_source=github&utm_medium=readme)
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* [Almost 10% faster than the "official" Arduino_JSON library](https://arduinojson.org/2019/11/19/arduinojson-vs-arduino_json/?utm_source=github&utm_medium=readme)
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* [Consumes roughly 10% less RAM than the "official" Arduino_JSON library](https://arduinojson.org/2019/11/19/arduinojson-vs-arduino_json/?utm_source=github&utm_medium=readme)
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* [Fixed memory allocation, no heap fragmentation](https://arduinojson.org/v6/api/jsondocument/?utm_source=github&utm_medium=readme)
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* [Optionally works without heap memory (zero malloc)](https://arduinojson.org/v6/api/staticjsondocument/?utm_source=github&utm_medium=readme)
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* Deduplicates strings
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* Versatile
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* Supports [custom allocators (to use external RAM chip, for example)](https://arduinojson.org/v6/how-to/use-external-ram-on-esp32/?utm_source=github&utm_medium=readme)
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* Supports [`String`](https://arduinojson.org/v6/api/config/enable_arduino_string/?utm_source=github&utm_medium=readme), [`std::string`](https://arduinojson.org/v6/api/config/enable_std_string/?utm_source=github&utm_medium=readme) and [`std::string_view`](https://arduinojson.org/v6/api/config/enable_string_view/?utm_source=github&utm_medium=readme)
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* Supports [`Stream`](https://arduinojson.org/v6/api/config/enable_arduino_stream/?utm_source=github&utm_medium=readme) and [`std::istream`/`std::ostream`](https://arduinojson.org/v6/api/config/enable_std_stream/?utm_source=github&utm_medium=readme)
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* Supports [Flash strings](https://arduinojson.org/v6/api/config/enable_progmem/?utm_source=github&utm_medium=readme)
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* Supports [custom readers](https://arduinojson.org/v6/api/json/deserializejson/?utm_source=github&utm_medium=readme#custom-reader) and [custom writers](https://arduinojson.org/v6/api/json/serializejson/?utm_source=github&utm_medium=readme#custom-writer)
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* Supports [custom converters](https://arduinojson.org/news/2021/05/04/version-6-18-0/?utm_source=github&utm_medium=readme)
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* Portable
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* Usable on any C++ project (not limited to Arduino)
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* Compatible with C++98, C++11, C++14 and C++17
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* Zero warnings with `-Wall -Wextra -pedantic` and `/W4`
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* [Header-only library](https://en.wikipedia.org/wiki/Header-only)
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* Works with virtually any board
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* Arduino boards: [Uno](https://amzn.to/38aL2ik), [Due](https://amzn.to/36YkWi2), [Micro](https://amzn.to/35WkdwG), [Nano](https://amzn.to/2QTvwRX), [Mega](https://amzn.to/36XWhuf), [Yun](https://amzn.to/30odURc), [Leonardo](https://amzn.to/36XWjlR)...
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* Espressif chips: [ESP8266](https://amzn.to/36YluV8), [ESP32](https://amzn.to/2G4pRCB)
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* Lolin (WeMos) boards: [D1 mini](https://amzn.to/2QUpz7q), [D1 Mini Pro](https://amzn.to/36UsGSs)...
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* Teensy boards: [4.0](https://amzn.to/30ljXGq), [3.2](https://amzn.to/2FT0EuC), [2.0](https://amzn.to/2QXUMXj)
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* Particle boards: [Argon](https://amzn.to/2FQHa9X), [Boron](https://amzn.to/36WgLUd), [Electron](https://amzn.to/30vEc4k), [Photon](https://amzn.to/387F9Cd)...
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* Texas Instruments boards: [MSP430](https://amzn.to/30nJWgg)...
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* Tested on all major development environments
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* [Arduino IDE](https://www.arduino.cc/en/Main/Software)
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* [Atmel Studio](http://www.atmel.com/microsite/atmel-studio/)
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* [Atollic TrueSTUDIO](https://atollic.com/truestudio/)
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* [Energia](http://energia.nu/)
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* [IAR Embedded Workbench](https://www.iar.com/iar-embedded-workbench/)
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* [Keil uVision](http://www.keil.com/)
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* [MPLAB X IDE](http://www.microchip.com/mplab/mplab-x-ide)
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* [Particle](https://www.particle.io/)
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* [PlatformIO](http://platformio.org/)
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* [Sloeber plugin for Eclipse](https://eclipse.baeyens.it/)
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* [Visual Micro](http://www.visualmicro.com/)
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* [Visual Studio](https://www.visualstudio.com/)
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* [Even works with online compilers like wandbox.org](https://wandbox.org/permlink/RlZSKy17DjJ6HcdN)
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* [CMake friendly](https://arduinojson.org/v6/how-to/use-arduinojson-with-cmake/?utm_source=github&utm_medium=readme)
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* Well designed
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* [Elegant API](http://arduinojson.org/v6/example/?utm_source=github&utm_medium=readme)
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* [Thread-safe](https://en.wikipedia.org/wiki/Thread_safety)
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* Self-contained (no external dependency)
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* `const` friendly
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* [`for` friendly](https://arduinojson.org/v6/api/jsonobject/begin_end/?utm_source=github&utm_medium=readme)
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* [TMP friendly](https://en.wikipedia.org/wiki/Template_metaprogramming)
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* Handles [integer overflows](https://arduinojson.org/v6/api/jsonvariant/as/?utm_source=github&utm_medium=readme#integer-overflows)
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* Well tested
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* [Unit test coverage close to 100%](https://coveralls.io/github/bblanchon/ArduinoJson?branch=6.x)
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* Continuously tested on
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* [Visual Studio 2010, 2012, 2013, 2015, 2017, 2019](https://ci.appveyor.com/project/bblanchon/arduinojson/branch/6.x)
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* [GCC 4.4, 4.6, 4.7, 4.8, 4.9, 5, 6, 7, 8, 9, 10](https://github.com/bblanchon/ArduinoJson/actions?query=workflow%3A%22Continuous+Integration%22)
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* [Clang 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 5.0, 6.0, 7, 8, 9, 10](https://github.com/bblanchon/ArduinoJson/actions?query=workflow%3A%22Continuous+Integration%22)
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* [Continuously fuzzed with Google OSS Fuzz](https://bugs.chromium.org/p/oss-fuzz/issues/list?sort=-opened&can=1&q=proj:arduinojson)
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* Passes all default checks of [clang-tidy](https://releases.llvm.org/10.0.0/tools/clang/tools/extra/docs/clang-tidy/)
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* Well documented
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* [Tutorials](https://arduinojson.org/v6/doc/deserialization/?utm_source=github&utm_medium=readme)
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* [Examples](https://arduinojson.org/v6/example/?utm_source=github&utm_medium=readme)
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* [How-tos](https://arduinojson.org/v6/example/?utm_source=github&utm_medium=readme)
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* [FAQ](https://arduinojson.org/v6/faq/?utm_source=github&utm_medium=readme)
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* [Troubleshooter](https://arduinojson.org/v6/troubleshooter/?utm_source=github&utm_medium=readme)
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* [Book](https://arduinojson.org/book/?utm_source=github&utm_medium=readme)
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* [Changelog](CHANGELOG.md)
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* Vibrant user community
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* Most popular of all Arduino libraries on [GitHub](https://github.com/search?o=desc&q=arduino+library&s=stars&type=Repositories)
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* [Used in hundreds of projects](https://www.hackster.io/search?i=projects&q=arduinojson)
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* [Responsive support](https://github.com/bblanchon/ArduinoJson/issues?q=is%3Aissue+is%3Aclosed)
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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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char json[] = "{\"sensor\":\"gps\",\"time\":1351824120,\"data\":[48.756080,2.302038]}";
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DynamicJsonDocument doc(1024);
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deserializeJson(doc, json);
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const char* sensor = doc["sensor"];
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long time = doc["time"];
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double latitude = doc["data"][0];
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double longitude = doc["data"][1];
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```
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See the [tutorial on arduinojson.org](https://arduinojson.org/doc/decoding/?utm_source=github&utm_medium=readme)
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### Serialization
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Here is a program that generates a JSON document with ArduinoJson:
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```c++
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DynamicJsonDocument doc(1024);
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doc["sensor"] = "gps";
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doc["time"] = 1351824120;
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doc["data"][0] = 48.756080;
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doc["data"][1] = 2.302038;
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serializeJson(doc, Serial);
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// This prints:
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// {"sensor":"gps","time":1351824120,"data":[48.756080,2.302038]}
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```
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See the [tutorial on arduinojson.org](https://arduinojson.org/doc/encoding/?utm_source=github&utm_medium=readme)
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## Support the project ❤️
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Do you like this library?
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Please [star this project on GitHub](https://github.com/bblanchon/ArduinoJson/stargazers)!
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What? You don't like it but you *love* it?
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You can support the project by [purchasing my book](https://arduinojson.org/book/?utm_source=github&utm_medium=readme).
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Alternatively, you can make a recurring donation via [GitHub Sponsors](https://github.com/sponsors/bblanchon).
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