Mongoose insertMany() Function

The insertMany() function is used to insert multiple documents into a collection. It accepts an array of documents to insert into the collection.

Syntax:

Model.insertMany()

Parameters: The Model.insertMany() method accepts three parameters:

• docs:  It is an array of objects which will be inserted into the collection.
• options: It is an object with various properties.
• callback: It is a callback function that will run once execution is completed.

Returns: The Model.insertMany() function returns a promise. The result contains an array of objects having details of documents inserted in the database.

Steps to Installation of Mongoose Module:

Step 1: You can visit the link Install Mongoose module. You can install this package by using this command.

npm install mongoose

Step 2: After installing the mongoose module, you can check your mongoose version in the command prompt using the command.

npm version mongoose

Project Structure:

The updated dependencies in package.json file will look like:

"dependencies": {
    "mongoose": "^7.6.5",
}

Example: Below the code example for the insertMany() method:

Javascript

const mongoose = require('mongoose');

// Database connection
mongoose.connect(
'mongodb://127.0.0.1:27017/geeksforgeeks',
    {
        useNewUrlParser: true,
        useCreateIndex: true,
        useUnifiedTopology: true
    });

// User model
const User = mongoose.model(
'User',
    {
        name: { type: String },
        age: { type: Number }
    });

// Function call
User.insertMany([
    { name: 'Gourav', age: 20 },
    { name: 'Kartik', age: 20 },
    { name: 'Niharika', age: 20 }
]).then(function () {
    console.log("Data inserted") // Success
}).catch(function (error) {
    console.log(error)     // Failure
});

Steps to run the program:

node index.js

After running above command, your can see the data is inserted into the database. You can use any GUI tool or terminal to see the database, like I have used Robo3T GUI tool as shown below:

So this is how you can use mongoose insertMany() function to insert multiple documents into the collection in MongoDB and Node.