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

JsonArray::createNestedObject() | ArduinoJson 6

Description

JsonArray::createNestedObject() appends a new object to the array pointed by the JsonArray.

If the JsonArray is null/unbound, this function does nothing.

Signature

JsonObject createNestedObject() const;

Return value

JsonArray::createNestedObject() returns a JsonObject that points to the newly created object.

JsonArray::createNestedObject() returns null if the memory allocation fails; in which case JsonObject::isNull(), returns true.

Example

StaticJsonDocument<200> doc;
JsonArray array = doc.to<JsonArray>();
JsonObject nested = array.createNestedObject();
nested["hello"] = "world";
serializeJson(array, Serial);

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