I need to randomly generate objectid in node js.Is there is any way to create.
ObjectID is automatically generated by the database drivers, and will be assigned to the _id field of each document. ObjectID can be considered globally unique for all practical purposes.
Using the uuid Package Unlike the crypto module, the uuid package is a third-party npm module. To install it, run the following command. uuid allows you to generate different ID versions: Version 1 and 4 generate a unique ID randomly generated.
Ids. By default, Mongoose adds an _id property to your schemas. const schema = new Schema(); schema.path('_id'); // ObjectId { ... } When you create a new document with the automatically added _id property, Mongoose creates a new _id of type ObjectId to your document.
MongoDB uses ObjectIds as the default value of _id field of each document, which is generated during the creation of any document. Object ID is treated as the primary key within any MongoDB collection. It is a unique identifier for each document or record.
If you mean a MongoDB ObjectID, try this:
var ObjectID = require('mongodb').ObjectID;
var objectId = new ObjectID();
Another way to generate the mongoDB object id is.
function objectId() {
const os = require('os');
const crypto = require('crypto');
const secondInHex = Math.floor(new Date()/1000).toString(16);
const machineId = crypto.createHash('md5').update(os.hostname()).digest('hex').slice(0, 6);
const processId = process.pid.toString(16).slice(0, 4).padStart(4, '0');
const counter = process.hrtime()[1].toString(16).slice(0, 6).padStart(6, '0');
return secondInHex + machineId + processId + counter;
}
Creating ObjectId in the mongodb:
const {ObjectId} = require('mongodb');
// Method 1:
const myId = new ObjectId(); // No argument
// say, myId = ObjectId("507f1f77bcf86cd799439011")
// Access the Hexadecimal String from the ObjectId
console.log(ObjectId("507f1f77bcf86cd799439011").str);
// 507f1f77bcf86cd799439011
// Method 2: Specify your own unique Hexadecimal String (12 bytes long)
const myId = new ObjectId("507f191e810c19729de860ea"); // with argument
// myId = ObjectId("507f191e810c19729de860ea")
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