How to add an Object to an Array?

[MaybeELEMENT]

Hello, I have a question. how can I add an object to an array?
so I have this JSON script:

[]

I want to make it to this:

[
{"label": "key", "value": "var"},
{"label": "string", "value": "hello world"}
]

But how can I do it?
I tried

res.push_back({json::object({"label", "key", "value", "var"})});
res.push_back({json::object({"label", "string", "value", "hello world"})});

But it just give me error:
libc++abi: terminating with uncaught exception of type nlohmann::detail::type_error: [json.exception.type_error.301] cannot create object from initializer list

[nlohmann]

The object function expects a list of pairs (see https://json.nlohmann.me/api/basic_json/object/). You could also use the second version of push_back and provide an object value directly (see https://json.nlohmann.me/api/basic_json/push_back/).

For your example:

res.push_back(json::object({{"label", "key"}, {"value", "var"}}));
res.push_back(json::object({{"label", "string"}, {"value", "hello world"}}));

You can also skip the json::object here, because list of pairs are treated as object anyway:

res.push_back({{"label", "key"}, {"value", "var"}});
res.push_back({{"label", "string"}, {"value", "hello world"}});