JsonObject::createNestedArray()
Description
JsonObject::createNestedArray() adds a new array to the object pointed by the JsonObject.
If the JsonObject is null/unbound, this function does nothing.
Signatures
JsonArray createNestedArray(char* key) const;
JsonArray createNestedArray(const char* key) const; // ⚠️ stores key as a pointer
JsonArray createNestedArray(const __FlashStringHelper* key) const;
JsonArray createNestedArray(const String& key) const;
JsonArray createNestedArray(const std::string& key) const;
JsonArray createNestedArray(std::string_view key) const;
Arguments
key: the key to associate with the array.
All types are stored by copy, except const char* which is stored by pointer.
Return value
JsonObject::createNestedArray() returns a JsonArray that points to the newly created array.
JsonObject::createNestedArray() return null if the memory allocation fails; in which case JsonArray::isNull(), returns true.
Example
StaticJsonDocument<256> doc;
JsonObject root = doc.to<JsonObject>();
root["status"] = "on";
JsonArray levels = root.createNestedArray("levels");
levels.add(10);
levels.add(20);
serializeJsonPretty(root, Serial);
will print
{
"status": "on",
"levels": [
10,
20
]
}
