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Showing content from https://arduinojson.org/v6/api/config/decode_unicode/ below:

ARDUINOJSON_DECODE_UNICODE | ArduinoJson 6

ArduinoJson can decode Unicode escape sequences (\uXXXX) in JSON documents, but you can disable this feature to reduce the library’s size.

ArduinoJson doesn’t handle NUL correctly: in your input contains \u0000, the string will be truncated.

When ARDUINOJSON_DECODE_UNICODE is set to 1, deserializeJson() converts the Unicode escape sequences to UTF-8 characters.

When ARDUINOJSON_DECODE_UNICODE is set to 0, deserializeJson() returns NotSupported when the input contains a Unicode escape sequence.

The default value is 1.

Only 0 and 1 are valid. Any other value (like false or true) will produce a compilation error.

The default value used to be 0. It changed to 1 in ArduinoJson 6.16

This feature increases the library’s size; that’s why it used to be disabled by default. The size increase depends on the microcontroller’s architecture, as you can see in the table below.

• Adafruit Circuit Playground Express
• Arduino MKR ZERO
• Arduino MKR1000
• Arduino MKR WiFi 1010
• Arduino NANO 33 IoT
• Arduino MKR WAN 1300
• Arduino MKR WAN 1310
• Arduino MKR GSM 1400
• Arduino MKR Vidor 4000
• Nucleo-32
• Nucleo-64
• STM32 Discovery
• Teensy LC

• Arduino Due
• Nucleo-144
• Maple Mini

• Teensy 3.2
• Teensy 3.5
• Teensy 3.6

• Teensy 4.0

• Adafruit Feather 32u4 Bluefruit LE
• Adafruit Metro Mini 328
• Arduino Mega 2560
• Arduino UNO
• Arduino UNO WiFi
• Arduino Leonardo
• Arduino Micro
• Arduino Nano
• Arduino Yún
• SparkFun RedBoard
• Teensy 2.0
• Teensy++ 2.0

• Arduino Nano Every
• Arduino UNO WiFi Rev 2

• Adafruit HUZZAH32
• LoLin D32 Pro

• Adafruit HUZZAH
• SparkFun ESP8266 Thing
• WeMos D1 Mini

These results depend on the compiler version.

If your input doesn’t contain any Unicode escape sequence, you remove this feature to reduce the library’s size. To do so, simply define ARDUINOJSON_DECODE_UNICODE to 0 before including ArduinoJson.h.

#define ARDUINOJSON_DECODE_UNICODE 0
#include <ArduinoJson.h>

StaticJsonDocument<300> doc;

deserializeJson(doc, "{'firstname':'Beno\\u00EEt'}");
    
Serial.println(doc["firstname"].as<const char*>()); // Benoît

👨‍🏫 Try this example online

Several .ino or .cpp files?

Be careful if several compilation units compose your program, i.e., if your project contains several .ino or .cpp files.

You should define the same value of ARDUINOJSON_DECODE_UNICODE in each compilation unit; otherwise, the executable will be much bigger because it will contain two variants of the library.

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2. Version 6
3. API
4. Configuration
5. ARDUINOJSON_DECODE_UNICODE

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