node.js - nodejs mongodb object id to string

Question

IN nodejs, with mongodb, mongoosejs as orm

I am doing this

I have a model, User

User.findOne({username:'someusername'}).exec(function(err,user){
console.log(user) //this gives full object with something like {_id:234234dfdfg,username:'someusername'}
//but

console.log(user._id) //give undefined.
})

Why? And how to get the _id to string then?

Answer 1

Try this:

user._id.toString()

A MongoDB ObjectId is a 12-byte UUID can be used as a HEX string representation with 24 chars in length. You need to convert it to string to show it in console using console.log.

So, you have to do this:

console.log(user._id.toString());