JsonDocument::as<T>()
Description
Casts JsonDocument to the specified type.
Unlike JsonDocument::to<T>(), this function doesn’t change the content of the JsonDocument.
Signature
JsonArray as<JsonArray>();
JsonObject as<JsonObject>();
JsonVariant as<JsonVariant>();
Return value
This function returns a reference to the root of the JsonDocument.
If the actual type of the root doesn’t match the requested type, this function returns a null reference. For example, suppose the JsonDocument is an array, if you call JsonDocument::as<JsonObject>(), it will return a null JsonObject.
Example
DynamicJsonDocument doc(1024);
deserializeJson(doc, "{\"key\":\"value\")");
// get the JsonObject in the JsonDocument
JsonObject root = doc.as<JsonObject>();
// get the value in the JsonObject
const char* value = root["key"];