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

JsonObject::memoryUsage() | ArduinoJson 6

JsonObject::memoryUsage() returns the number of bytes used by the object pointed by the JsonObject.

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

size_t memoryUsage() const;

char json[] = "{\"a\":1,\"b\":2}";
StaticJsonDocument<200> doc;
deserializeJson(doc, json);

JsonObject object = doc.as<JsonObject>();
object.remove("b"); // remove last member to show the effect of a leak

Serial.println(object.memoryUsage());  // 10 on AVR
Serial.println(doc.memoryUsage());     // 16 on AVR

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

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4. JsonObject
5. memoryUsage()

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