Convert string to ObjectID in MongoDB

Question

I am developing an API using Codeigniter and MongoDB. In some parts of the database I have saved the ID of an image in ObjectID format instead of a string. Now I got an ID in string format and I need to query the database using it.

How can I "convert" a string to an ObjectID so that I can do the query?

From this:

34234234234234234234

To this:

ObjectID("34234234234234234234")

Answer 1

Using mongoose:

var mongoose = require('mongoose');
var objectId = mongoose.Types.ObjectId('569ed8269353e9f4c51617aa');

Using native driver (https://stackoverflow.com/a/21076589/3377073)

var ObjectId = require('mongodb').ObjectId;
doc._id = new ObjectId(doc._id); // wrap in ObjectID

Answer 2

You just need to require the ObjectId function from your mongo.

ObjectId = require('mongodb').ObjectID;

Then you can use it like that:

ObjectId("34234234234234234234")

Answer 3

If you are using Meteor

var id = new Mongo.ObjectID("34234234234234234234");

Answer 4

you can now convert string to objectId on mongodb 4.0 and above. there is new feature to convert from string id to objectId

here you can see the documentation $toObjectId

Answer 5

or better use

var mongodb = require(‘mongodb’); //this might have been defined at the beginning of your code.
//now use it
query = {_id:mongodb.ObjectId('569ed8269353e9f4c51617aa')};

and the rest is the same.

Answer 6

^{(Extracted from the question)}

---

I found a solution. Just do this:

new MongoId('34234234234234234234');

Answer 7

If you are in an aggregation you can use the following :

{
   $toObjectId: <expression>
}

Which is a shortcut for :

{ $convert: { input: <expression>, to: "objectId" } }

From mongodb documentation

Answer 8

import { ObjectId } from 'mongodb'
const query  = {"_id":ObjectId(req.params.productId)}

Answer 9

mongo DB version v3.6.3

how to save string input to MongoDB ObjectId on express controller code

const mongoose = require('mongoose');
var ObjectId = require('mongodb').ObjectId;
user: mongoose.Types.ObjectId(req.body.user)
console.log(user, typeof(user))