How to find datatype of all the fields in Mongo

Question

I have a doc

{_id:NumberLong(1),gender:"M",vip:false}.

How to extract the type of individual field in Mongo with a query.. How to use typeof operator:

https://docs.mongodb.org/manual/core/shell-types/

Answer 1

> db.test.findOne()
{ "_id" : NumberLong(1), "gender" : "M", "vip" : false }
> db.test.findOne().gender
M
> typeof db.test.findOne().gender
string