Correct way to search for MongoDB entries by '_id' in Node

Question

I'm using MongoDb (as part of MongoJS) in Node. Here is the documentation for MongoJS.

I'm trying to do a call within Node based on an entry's _id field. When using vanilla MongoDB from the console, I can do:

db.products.find({"_id":ObjectId("51d151c6b918a71d170000c7")})

and it correctly returns my entry. However, when I do the same thing in Node, like:

db.products.find({"_id": ObjectId("51d151c6b918a71d170000c7")}, function (err, record) {
    // Do stuff
});

I get ReferenceError: ObjectId is not defined.

What is the correct protocol for doing this?

score 124 · Accepted Answer · answered Jul 09 '13 at 10:08

124

You need to require the ObjectId function before using it:

var ObjectId = require('mongodb').ObjectID;

answered Jul 09 '13 at 10:08

Chris

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4

I used `var ObjectId = require("mongojs").ObjectId;`, but works just as well! Cheers. – JVG Jul 09 '13 at 10:16
8

Or [`require('mongoose').Schema.ObjectId`](http://stackoverflow.com/questions/8111846/how-to-set-objectid-as-a-data-type-in-mongoose) – laggingreflex Mar 06 '14 at 00:17
1

The Mongoose schema one didn't work for me. Mongodb did. – PanMan Jun 09 '16 at 10:57
As per `Mongoose`, _To create a new ObjectId please try `Mongoose.Types.ObjectId` instead of using `Mongoose.Schema.ObjectId`. Set the `suppressWarning` option if you're trying to create a hex char path in your schema._ – Vaishak Sep 25 '18 at 06:52

score 2 · Answer 2 · edited Feb 27 '16 at 18:14

2

If you are using MongoJS, you can do:

var ObjectId = mongojs.ObjectId;

Then,

db.users.find({"_id": ObjectId(id)}, function(err, user){...}

edited Feb 27 '16 at 18:14

Nidhin David

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answered Jan 18 '16 at 11:05

Amol

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score 2 · Answer 3 · answered Jan 12 '17 at 14:29

if you are using mongoose you can try this:

var mongoose = require('mongoose')
usersSchema = mongoose.model('users'),
mongoose.Types.ObjectId("<object_id>")

usersSchema.find({"_id": mongoose.Types.ObjectId("<object_id>")}, function (err, record) {
// Do stuff
});

score 2 · Answer 4 · answered Sep 13 '18 at 16:42

2

You can also destructure your ObjectId and MongoClient to optimize your code and make it more readable.

const { MongoClient, ObjectId } = require('mongodb');

answered Sep 13 '18 at 16:42

Israel Ortiz Cortés

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score 1 · Answer 5 · answered Apr 20 '19 at 06:05

Here's another way to utilise objectId when using mongoose.

// at the top of the file
const Mongoose = require('mongoose')
const ObjectId = Mongoose.Types.ObjectId;

// when using mongo to collect data
Mongoose.model('users', userSchema).findOne({ _id: 
    ObjectId('xyz') }, function (err, user) {
        console.log(user)
        return handle(req, res)
    })
})

Correct way to search for MongoDB entries by '_id' in Node

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