Need help with ArduinoJson?
Click the “chat” button below for chat support from the developer who created it, or find similar developers for support.

About the developer

5.4K Stars 970 Forks MIT License 1.5K Commits 15 Opened issues


📟 JSON library for Arduino and embedded C++. Simple and efficient.

Services available


Need anything else?

Contributors list


GitHub Workflow Status Continuous Integration Fuzzing Status Coverage Status

Discord GitHub stars GitHub Sponsors


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




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; doc["data"][0] = 48.756080; doc["data"][1] = 2.302038;

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

See the tutorial on

Support the project ❤️

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

What? You don't like it, but you love it?
You can support the project by purchasing my book. Alternatively, you can make a recurring donation via GitHub Sponsors.

We use cookies. If you continue to browse the site, you agree to the use of cookies. For more information on our use of cookies please see our Privacy Policy.