how to get values form mongodb object in nodejs

I have an object which is the outcome of the mongodb query. How can i get ques_id in this object

{ result: { ok: 1, n: 1 },
 ops:
 [ { ques_id: 591eb7f5546f8d15d8c8eeec,
   user_id: 58dfdeb6b052651ffc5bd25f,
   ans_text: 'fire answer',
   post_pic: '',
   likes: 0,
   like_by: '',
   dislike_by: '',
   _id: 591ebdd819e7c512384c03be } ],
    insertedCount: 1,
    insertedIds: [ 591ebdd819e7c512384c03be ] }

via Rohit Kumar