ArduinoJson is a C++ JSON library for Arduino and IoT (Internet Of Things).
- JSON deserialization
- Optionally decodes UTF-16 escape sequences to UTF-8
- Optionally stores links to the input buffer (zero-copy)
- Optionally supports comments in the input
- Optionally filters the input to keep only desired values
- Supports single quotes as a string delimiter
- Compatible with NDJSON and JSON Lines
- JSON serialization
- MessagePack serialization
- MessagePack deserialization
- Efficient
- Twice smaller than the "official" Arduino_JSON library
- Almost 10% faster than the "official" Arduino_JSON library
- Consumes roughly 10% less RAM than the "official" Arduino_JSON library
- Fixed memory allocation, no heap fragmentation
- Optionally works without heap memory (zero malloc)
- Deduplicates strings
- Versatile
- Supports custom allocators (to use external RAM chip, for example)
- Supports Arduino's
Stringand STL'sstd::string - Supports Arduino's
Streamand STL'sstd::istream/std::ostream - Supports Flash strings
- Supports custom readers and custom writers
- Portable
- Usable on any C++ project (not limited to Arduino)
- Compatible with C++98
- Zero warnings with
-Wall -Wextra -pedanticand/W4 - Header-only library
- Works with virtually any board
- Tested on all major development environments
- Even works with online compilers like wandbox.org
- CMake friendly
- Well designed
- Elegant API
- Thread-safe
- Self-contained (no external dependency)
constfriendlyforfriendly- TMP friendly
- Handles integer overflows
- Well tested
- Well documented
- Vibrant user community
- Most popular of all Arduino libraries on GitHub and PlatformIO
- Used in hundreds of projects
- Responsive support
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 arduinojson.org
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 arduinojson.org
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