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

Special note ⚠️

ArduinoJson 6 requires updating code written for version 5. See the migration guide for details.

Changes since 6.8.0-beta

• Decode escaped Unicode characters like \u00DE (issue #304, PR #791) Many thanks to Daniel Schulte (aka @trilader) who implemented this feature.
• Added option ARDUINOJSON_DECODE_UNICODE to enable it
• Converted JsonArray::copyFrom()/copyTo() to free functions copyArray()
• Renamed JsonArray::copyFrom() and JsonObject::copyFrom() to set()
• Renamed JsonArray::get() to getElement()
• Renamed JsonArray::add() (without arg) to addElement()
• Renamed JsonObject::get() to getMember()
• Renamed JsonObject::getOrCreate() to getOrAddMember()
• Fixed JsonVariant::isNull() not returning true after set((char*)0)
• Fixed segfault after variant.set(serialized((char*)0))
• Detect IncompleteInput in false, true, and null
• Added JsonDocument::size()
• Added JsonDocument::remove()
• Added JsonVariant::clear()
• Added JsonVariant::remove()

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-v6.9.0.h put it in your project folder
3. Download ArduinoJson-v6.9.0.zip and extract it in you libraries folder

Note: ArduinoJson-v6.9.0.h are ArduinoJson-v6.9.0.hpp are almost identical; the difference is that the .hpp keeps everything in the ArduinoJson namespace.

Try online

• JsonGeneratorExample
• JsonParserExample
• MsgPackParserExample