Arduinojson: Detect if object exist?

[koffienl]

If read the wiki, but can't find a anwer. I'm feeling I'm overlooking something but can
t find out the correct way.
Let's say I have this simple json:

{
    "object1":
    {
        "key": "val"
    },
    "object2":
    {
        "key": "val"
    }
}

Now, I want to detect if object2 exists at all, before writing to it.
When trying to find out it a object is empty or not:

JsonObject& obj = json[char_object];
if (obj.containsKey(char_item))

This would be false when the key doesn't exist _or_ the entire object doesn't exist. How can I find out if the object even exist before doing a containsKey ?

[bblanchon]

char json[] = "{\"object1\":{},\"object2\":{}}";
JsonObject& root = jsonBuffer.parseObject(json);
if (root.containsKey("object2")) {
   Serial.println("Found object2 !");
}

[koffienl]

Thank you!

[bblanchon]

You're welcome, thanks for using ArduinoJson.

Don't hesitated to edit the wiki if you think you can improve it.
In particular, feel free to add you projects to Projects using ArduinoJson.
Also, a GitHub star is always appreciated :wink: