ArduinoJson 6.14.0

Looking for a human-readable version?
📰 Read the article on arduinojson.org

Changes since 6.13.0

• Added BasicJsonDocument::shrinkToFit()
• Added support of uint8_t for serializeJson(), serializeJsonPretty(), and serializeMsgPack() (issue #1142)
• Added ARDUINOJSON_ENABLE_COMMENTS to enable support for comments (defaults to 0)
• Auto enable support for std::string and std::stream on modern compilers (issue #1156)
  (No need to define ARDUINOJSON_ENABLE_STD_STRING and ARDUINOJSON_ENABLE_STD_STREAM anymore)
• Improved decoding of UTF-16 surrogate pairs (PR #1157 by @kaysievers)
  (ArduinoJson now produces standard UTF-8 instead of CESU-8)
• Added measureJson, measureJsonPretty, and measureMsgPack to keywords.txt
  (This file is used for syntax highlighting in the Arduino IDE)
• Fixed variant.is<nullptr_t>()
• Fixed value returned by serializeJson(), serializeJsonPretty(), and serializeMsgPack() when writing to a String
• Improved speed of serializeJson(), serializeJsonPretty(), and serializeMsgPack() when writing to a String

BREAKING CHANGES ⚠️

Support for comments in input is now optional and disabled by default.

If you need support for comments, you must defined ARDUINOJSON_ENABLE_COMMENTS to 1; otherwise, you'll receive InvalidInput errors.

#define ARDUINOJSON_ENABLE_COMMENTS 1
#include <ArduinoJson.h>

View version history

How to install

There are several ways to install ArduinoJson, from simpler to more complex:

1. Use the Arduino Library Manager
2. Download ArduinoJson-v6.14.0.h put it in your project folder
3. Download ArduinoJson-v6.14.0.zip and extract it in you libraries folder

Note: ArduinoJson-v6.14.0.h and ArduinoJson-v6.14.0.hpp are almost identical; the difference is that the .hpp keeps everything in the ArduinoJson namespace.

Try online

• JsonGeneratorExample
• JsonParserExample
• MsgPackParserExample