Mongoose | deleteMany() Function

The deleteMany() function is used to delete all of the documents that match conditions from the collection. This function behaves like the remove() function but it deletes all documents that match conditions regardless of the single option.

Installation of mongoose module:

  1. You can visit the link to Install mongoose module. You can install this package by using this command.
    npm install mongoose
  2. After installing mongoose module, you can check your mongoose version in command prompt using the command.
    npm version mongoose
  3. After that, you can just create a folder and add a file for, example index.js. To run this file you need to run the following command.
    node index.js

Filename: index.js

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const mongoose = require('mongoose');
  
// Database connection
    useNewUrlParser: true,
    useCreateIndex: true,
    useUnifiedTopology: true
});
  
// User model
const User = mongoose.model('User', {
    name: { type: String },
    age: { type: Number }
});
  
// Function call
// Deleting all users whose age >= 15
User.deleteMany({ age: { $gte: 15 } }).then(function(){
    console.log("Data deleted"); // Success
}).catch(function(error){
    console.log(error); // Failure
});

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Steps to run the program:

  1. The project structure will look like this:
    project structure
  2. Make sure you have installed mongoose module using following command:
    npm install mongoose
  3. Below is the sample data in the database before the deleteMany() function is executed, You can use any GUI tool or terminal to see the database, like we have used Robo3T GUI tool as shown below:
    Database after delete command
  4. Run index.js file using below command:
    node index.js

    Output of above command

  5. After running above command, your can see the data is deleted from the database.
    Database after delete command

So this is how you can use mongoose deleteMany() function to delete multiple documents from the collection in MongoDB and Node.js.

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