public void add_member (string member_name, owned Node node)
Warning: add_member is deprecated since 0.8. Use Json.Object.set_member.
Adds a new member for the given name and value into an object.
Use [method@Json.Object.set_member] instead
This function will return if the object already contains a member with the same name.
a JSON object
the name of the member
the value of the member