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How can I generate an ObjectId with mongoose?

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What is ObjectId in Mongoose?

ObjectId . A SchemaType is just a configuration object for Mongoose. An instance of the mongoose. ObjectId SchemaType doesn't actually create MongoDB ObjectIds, it is just a configuration for a path in a schema.

How do you create a new object ID?

To create a new objectID manually within the MongoDB you can declare objectId as a method. In simple words, we can say that object ID is a unique identifier for each record. In the below image you can observe that we are declaring a variable having object ID method as a value and it will return unique hexadecimal.

How do I get the ObjectId after I save an object in Mongoose?

To get the object ID after an object is saved in Mongoose, we can get the value from the callback that's run after we call save . const { Schema } = require('mongoose') mongoose. connect('mongodb://localhost/lol', (err) => { if (err) { console. log(err) } }); const ChatSchema = new Schema({ name: String }); mongoose.

Does Mongoose auto generate ID?

_id field is auto generated by Mongoose and gets attached to the Model, and at the time of saving/inserting the document into MongoDB, MongoDB will use that unique _id field which was generated by Mongoose.


You can find the ObjectId constructor on require('mongoose').Types. Here is an example:

var mongoose = require('mongoose');
var id = mongoose.Types.ObjectId();

id is a newly generated ObjectId.


Note: As Joshua Sherman points out, with Mongoose 6 you must prefix the call with new:

var id = new mongoose.Types.ObjectId();

You can read more about the Types object at Mongoose#Types documentation.


You can create a new MongoDB ObjectId like this using mongoose:

var mongoose = require('mongoose');
var newId = new mongoose.mongo.ObjectId('56cb91bdc3464f14678934ca');
// or leave the id string blank to generate an id with a new hex identifier
var newId2 = new mongoose.mongo.ObjectId();

I needed to generate mongodb ids on client side.

After digging into the mongodb source code i found they generate ObjectIDs using npm bson lib.

If ever you need only to generate an ObjectID without installing the whole mongodb / mongoose package, you can import the lighter bson library :

const bson = require('bson');
new bson.ObjectId(); // 5cabe64dcf0d4447fa60f5e2

Note: There is also an npm project named bson-objectid being even lighter


With ES6 syntax

import mongoose from "mongoose";

// Generate a new new ObjectId
const newId2 = new mongoose.Types.ObjectId();
// Convert string to ObjectId
const newId = new mongoose.Types.ObjectId('56cb91bdc3464f14678934ca');