JsonVariantConst::memoryUsage()
Description
JsonVariantConst::memoryUsage() returns the number of bytes used by the value pointed by the JsonVariantConst.
Unlike JsonDocument::memoryUsage(), the result doesn’t include leaked memory.
Signature
size_t memoryUsage() const;
Example
char json[] = "{\"a\":1,\"b\":2}";
StaticJsonDocument<200> doc;
deserializeJson(doc, json);
doc.remove("b"); // remove last member to show the effect of a leak
JsonVariantConst var = doc.as<JsonVariant>();
Serial.println(var.memoryUsage()); // 10 on AVR
Serial.println(doc.memoryUsage()); // 16 on AVR
