ArduinoJson 6.14.1

Changes since 6.14.0

• Fixed regression in UTF16 decoding (issue #1173)
• Fixed containsKey() on JsonVariantConst
• Added getElement() and getMember() to JsonVariantConst

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-v6.14.1.h put it in your project folder
3. Download ArduinoJson-v6.14.1.zip and extract it in you libraries folder

Note: ArduinoJson-v6.14.1.h and ArduinoJson-v6.14.1.hpp are almost identical; the difference is that the .hpp keeps everything in the ArduinoJson namespace.

Try online

• JsonGeneratorExample
• JsonParserExample
• MsgPackParserExample

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

ArduinoJson 6.13.0

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

Changes since 6.12.0

• Added support for custom writer/reader classes (issue #1088)
• Added conversion from JsonArray and JsonObject to bool, to be consistent with JsonVariant
• Fixed deserializeJson() when input contains duplicate keys (issue #1095)
• Improved deserializeMsgPack() speed by reading several bytes at once
• Added detection of Atmel AVR8/GNU C Compiler (issue #1112)
• Fixed deserializer that stopped reading at the first 0xFF (PR #1118 by @mikee47)
• Fixed dangling reference in copies of MemberProxy and ElementProxy (issue #1120)

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-v6.13.0.h put it in your project folder
3. Download ArduinoJson-v6.13.0.zip and extract it in you libraries folder

Note: ArduinoJson-v6.13.0.h and ArduinoJson-v6.13.0.hpp are almost identical; the difference is that the .hpp keeps everything in the ArduinoJson namespace.

Try online

• JsonGeneratorExample
• JsonParserExample
• MsgPackParserExample

ArduinoJson 6.12.0

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

Changes since 6.11.5

• Use absolute instead of relative includes (issue #1072)
• Changed JsonVariant::as<bool>() to return true for any non-null value (issue #1005)
• Moved ancillary files to extras/ (issue #1011)

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-v6.12.0.h put it in your project folder
3. Download ArduinoJson-v6.12.0.zip and extract it in you libraries folder

Note: ArduinoJson-v6.12.0.h and ArduinoJson-v6.12.0.hpp are almost identical; the difference is that the .hpp keeps everything in the ArduinoJson namespace.

Try online

• JsonGeneratorExample
• JsonParserExample
• MsgPackParserExample

ArduinoJson 6.11.5

Changes since 6.11.4

• Added fallback implementations of strlen_P(), strncmp_P(), strcmp_P(), and memcpy_P() (issue #1073)

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-v6.11.5.h put it in your project folder
3. Download ArduinoJson-v6.11.5.zip and extract it in you libraries folder

Note: ArduinoJson-v6.11.5.h and ArduinoJson-v6.11.5.hpp are almost identical; the difference is that the .hpp keeps everything in the ArduinoJson namespace.

Try online

• JsonGeneratorExample
• JsonParserExample
• MsgPackParserExample

ArduinoJson 6.11.4

Changes since 6.11.3

• Added measureJson() to the ArduinoJson namespace (PR #1069 by @nomis)
• Added support for basic_string<char, traits, allocator> (issue #1045)
• Fixed example JsonConfigFile.ino for ESP8266
• Include Arduino.h if ARDUINO is defined (PR #1071 by @nomis)

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-v6.11.4.h put it in your project folder
3. Download ArduinoJson-v6.11.4.zip and extract it in you libraries folder

Note: ArduinoJson-v6.11.4.h and ArduinoJson-v6.11.4.hpp are almost identical; the difference is that the .hpp keeps everything in the ArduinoJson namespace.

Try online

• JsonGeneratorExample
• JsonParserExample
• MsgPackParserExample

ArduinoJson 6.11.3

Changes since 6.11.2

• Added operators == and != for JsonDocument, ElementProxy, and MemberProxy
• Fixed comparison of JsonVariant when one contains a linked string and the other contains an owned string (issue #1051)

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-v6.11.3.h put it in your project folder
3. Download ArduinoJson-v6.11.3.zip and extract it in you libraries folder

Note: ArduinoJson-v6.11.3.h and ArduinoJson-v6.11.3.hpp are almost identical; the difference is that the .hpp keeps everything in the ArduinoJson namespace.

Try online

• JsonGeneratorExample
• JsonParserExample
• MsgPackParserExample

ArduinoJson 6.11.2

Changes since 6.11.1

• Fixed assignment of JsonDocument to JsonVariant (issue #1023)
• Fix invalid conversion error on Particle Argon (issue #1035)

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-v6.11.2.h put it in your project folder
3. Download ArduinoJson-v6.11.2.zip and extract it in you libraries folder

Note: ArduinoJson-v6.11.2.h and ArduinoJson-v6.11.2.hpp are almost identical; the difference is that the .hpp keeps everything in the ArduinoJson namespace.

Try online

• JsonGeneratorExample
• JsonParserExample
• MsgPackParserExample

ArduinoJson 6.11.1

Changes since 6.11.0

• Fixed serialized() not working with Flash strings (issue #1030)

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-v6.11.1.h put it in your project folder
3. Download ArduinoJson-v6.11.1.zip and extract it in you libraries folder

Note: ArduinoJson-v6.11.1.h and ArduinoJson-v6.11.1.hpp are almost identical; the difference is that the .hpp keeps everything in the ArduinoJson namespace.

Try online

• JsonGeneratorExample
• JsonParserExample
• MsgPackParserExample

ArduinoJson 6.11.0

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

Changes since 6.10.1

• Fixed deserializeJson() silently accepting a Stream* (issue #978)
• Fixed invalid result from operator| (issue #981)
• Made deserializeJson() more picky about trailing characters (issue #980)
• Added ARDUINOJSON_ENABLE_NAN (default=0) to enable NaN in JSON (issue #973)
• Added ARDUINOJSON_ENABLE_INFINITY (default=0) to enable Infinity in JSON
• Removed implicit conversion in comparison operators (issue #998)
• Added lexicographical comparison for JsonVariant
• Added support for nullptr (issue #998)

BREAKING CHANGES

NaN and Infinity

The JSON specification allows neither NaN not Infinity, but previous
versions of ArduinoJson supported it. Now, ArduinoJson behaves like most
other libraries: a NaN or and Infinity in the JsonDocument, becomes
a null in the output JSON. Also, deserializeJson() returns
InvalidInput if the JSON document contains NaN or Infinity.

This version still supports NaN and Infinity in JSON documents, but
it's disabled by default to be compatible with other JSON parsers.
If you need the old behavior back, define ARDUINOJSON_ENABLE_NAN and
ARDUINOJSON_ENABLE_INFINITY to 1:

#define ARDUINOJSON_ENABLE_NAN 1
#define ARDUINOJSON_ENABLE_INFINITY 1
#include <ArduinoJson.h>

The "or" operator

This version slightly changes the behavior of the | operator when the
variant contains a float and the user requests an integer.

Older versions returned the floating point value truncated.
Now, it returns the default value.

// suppose variant contains 1.2
int value = variant | 3;

// old behavior:
value == 1

// new behavior
value == 3

If you need the old behavior, you must add if (variant.is<float>()).

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-v6.11.0.h put it in your project folder
3. Download ArduinoJson-v6.11.0.zip and extract it in you libraries folder

Note: ArduinoJson-v6.11.0.h and ArduinoJson-v6.11.0.hpp are almost identical; the difference is that the .hpp keeps everything in the ArduinoJson namespace.

Try online

• JsonGeneratorExample
• JsonParserExample
• MsgPackParserExample