[{_id:ObjectId("652edd74bdb84c9944d280d6"),customer_id:1001,first_name:"Test",last_name:"User",username:"Tuser",password:"Testuser",registration_date:new Date("2023-10-17T13:54:54.000Z")},{username:"other"}]

db.collection.find({"username":"Tuser"},{"_id":0,"customer_id":1,"first_name":1,"last_name":1,"username":1})