A C++ JSON library for Arduino and IoT devices, focusing on efficiency and minimal resource usage.
ArduinoJson is a C++ JSON library specifically designed for Arduino and embedded IoT devices. It enables these resource-constrained systems to parse, generate, and manipulate JSON data efficiently, which is essential for web APIs, configuration files, and device communication. The library solves the problem of handling JSON on microcontrollers where memory and processing power are limited.
Embedded C++ developers working with Arduino, ESP8266, ESP32, and other IoT platforms who need to integrate JSON communication in their projects.
Developers choose ArduinoJson for its superior efficiency—it's smaller, faster, and uses less RAM than alternatives—along with its portability across boards and toolchains, comprehensive features like MessagePack support, and robust documentation.
📟 JSON library for Arduino and embedded C++. Simple and efficient.
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Benchmarks in the README show it's twice smaller and 10% faster than the official Arduino_JSON library, with lower RAM consumption, crucial for resource-constrained embedded systems.
Header-only library compatible with C++11 to C++17, works on virtually any board from Arduino Uno to ESP32, and integrates with all major IDEs and toolchains like PlatformIO and Arduino IDE.
Handles both JSON and MessagePack serialization/deserialization, providing flexibility for compact data transmission in IoT devices, as highlighted in the features list.
Supports custom allocators, readers, writers, and converters, allowing integration with external RAM chips or specific data types, enhancing versatility for unique embedded scenarios.
Near 100% test coverage, continuous fuzzing, and comprehensive tutorials, examples, and a book ensure reliability and ease of learning, as documented in the README.
Lacks support for JSON Schema validation, JSON Patch, or other advanced JSON standards beyond basic parsing and generation, restricting use in complex data validation scenarios.
Requires pre-sizing of JsonDocument buffers, which can lead to buffer overflows or inefficiencies for dynamic JSON structures, unlike libraries with dynamic memory management on larger systems.
C++98/03 compatibility is only available in the older 6.x branch, creating version fragmentation and maintenance challenges for projects stuck on older compilers, as noted in the README.
ArduinoJson is an open-source alternative to the following products: