begin_object

Opens an object inside the given builder.

You can add a new member to the object by using [method@Json.Builder.set_member_name], followed by [method@Json.Builder.add_value].

Once you added all members to the object, you must call [method@Json.Builder.end_object] to close the object.

If the builder is in an inconsistent state, this function will return `NULL`.

Parameters:

this

a builder

Returns:

the builder instance