ArduinoJson6113 (community library)


Name Value
Name ArduinoJson6113
Version 6.11.3
Installs 1334
License MIT
Author Benoit Blanchon <>
Maintainer Benoit Blanchon <>
Download .tar.gz

An efficient and elegant JSON library for Arduino. ArduinoJson supports ✔ serialization, ✔ deserialization, ✔ MessagePack, ✔ fixed allocation, ✔ zero-copy, ✔ streams, and more. It is the most popular Arduino library on GitHub ❤❤❤❤❤. Check out for a comprehensive documentation.

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Library Read Me

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ArduinoJson is a C++ JSON library for Arduino and IoT (Internet Of Things).


  • JSON decoding (comments are supported)
  • JSON encoding (with optional indentation)
  • MessagePack
  • Elegant API, easy to use
  • Fixed memory allocation (zero malloc)
  • No data duplication (zero copy)
  • Portable (written in C++98, can be used in any C++ project)
  • Self-contained (no external dependency)
  • Small footprint
  • Input and output streams
  • 100% code coverage
  • Header-only library
  • MIT License
  • Comprehensive documentation


ArduinoJson works on the following hardware:

ArduinoJson compiles with zero warning on the following compilers, IDEs, and platforms:



Here is a program that parses a JSON document with ArduinoJson.

char json[] = "{\"sensor\":\"gps\",\"time\":1351824120,\"data\":[48.756080,2.302038]}";

DynamicJsonDocument doc(1024);
deserializeJson(doc, json);

const char* sensor = doc["sensor"];
long time          = doc["time"];
double latitude    = doc["data"][0];
double longitude   = doc["data"][1];

See the tutorial on


Here is a program that generates a JSON document with ArduinoJson:

DynamicJsonDocument doc(1024);

doc["sensor"] = "gps";
doc["time"]   = 1351824120;

JsonArray data = doc.createNestedArray("data");

serializeJson(doc, Serial);
// This prints:
// {"sensor":"gps","time":1351824120,"data":[48.756080,2.302038]}

See the tutorial on


The documentation is available on, here are some shortcuts:

  • The Examples show how to use the library in various situations.
  • The API Reference contains the description of each class and function.
  • The FAQ has the answer to virtually every question.
  • The ArduinoJson Assistant writes programs for you!

Do you like this library? Please star this project on GitHub!

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