How do I destructure the object below?

I want to get some data from the property caps_. I'm getting this data from an API and every time I try it returns undefined.

tabs_: {
    Promise {
      Session {
        id_: '4083ce6f-f536-41bd-9f4e-9c1a66c4486f',
        caps_: Capabilities { map_: [Map]; }
    }
  }
}

Here`s my code...

const caps = tabs_.caps_;
console.log(caps);

Even when I try to get the value of id_ , it returns undefined yet I can see a value in there without writing any code.