JsonObject::createNestedObject()
Description
JsonObject::createNestedObject() appends a new object to the object pointed by the JsonObject.
If the JsonObject is null/unbound, this function does nothing.
Signature
JsonObject createNestedObject(char* key) const;
JsonObject createNestedObject(const char* key) const; // ⚠️ stores key as a pointer
JsonObject createNestedObject(const __FlashStringHelper* key) const;
JsonObject createNestedObject(const String& key) const;
JsonObject createNestedObject(const std::string& key) const;
JsonObject createNestedObject(std::string_view key) const;
Arguments
key: the key to associate with the new object.
All types are stored by copy, except const char* which is stored by pointer.
Return value
JsonObject::createNestedObject() returns a JsonObject that points to the newly created object.
JsonObject::createNestedObject() returns null if the memory allocation fails; in which case JsonObject::isNull(), returns true.
Example
StaticJsonDocument<256> doc;
JsonObject root = doc.to<JsonObject>();
root["city"] = "Paris";
JsonObject weather = root.createNestedObject("weather");
weather["temp"] = 14.2;
weather["cond"] = "cloudy";
serializeJsonPretty(root, Serial);
will print
{
"city": "Paris",
"weather": {
"temp": 14.20,
"cond": "cloudy"
}
}
