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Showing content from https://arduinojson.org/v6/api/jsonarray/memoryusage/ below:

JsonArray::memoryUsage() | ArduinoJson 6

JsonArray::memoryUsage() returns the number of bytes used by the array pointed by the JsonArray.

Unlike JsonDocument::memoryUsage(), the result doesn’t include leaked memory.

size_t memoryUsage() const;

char json[] = "[1,2,3]";
StaticJsonDocument<200> doc;
deserializeJson(doc, json);

JsonArray array = doc.as<JsonArray>();
array.remove(2); // remove last element to show the effect of a leak

Serial.println(array.memoryUsage());  // 16 on AVR
Serial.println(doc.memoryUsage());    // 24 on AVR

• JsonArray::size()
• JsonDocument::memoryUsage()
• JsonDocument::capacity()

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4. JsonArray
5. memoryUsage()

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