Mongoose Connection Close()

Introduction

Mongoose is a popular Node.js library that provides a way to interact with MongoDB databases. One of the key features of Mongoose is its ability to manage connections with MongoDB. In this article, we will discuss the close() method available to Mongoose connections.

The close() Method

The close() method in Mongoose is used to close the connection between your Node.js application and MongoDB. This method is particularly useful when your application is shutting down or when you no longer need to communicate with MongoDB.

Here's an example of how to use the close() method:

const mongoose = require('mongoose');

mongoose.connect('mongodb://localhost:27017/myapp');

// Wait for connection to be established
const db = mongoose.connection;
db.once('open', function() {

  // Perform queries/transfers
  // ...

  // Close the connection
  mongoose.connection.close();
});

As shown above, first we establish a connection to the MongoDB database using mongoose.connect(). When the connection is established, we perform some queries/transfers and then call the close() method to close the connection.

Parameters

The close() method does not take any parameters.

Return Value

The close() method returns a promise that resolves when the connection has been successfully closed. You can chain this promise to perform any additional activities you need to do after the connection has been closed.

Here's an example:

mongoose.connection.close().then(() => {
  console.log('Connection closed');
}).catch(() => {
  console.log('Error closing connection');
});

When to Use close()

As mentioned earlier, you should use the close() method in your Node.js application when you no longer need to communicate with MongoDB. This could be in cases where:

• Your application is shutting down
• You are switching between databases
• You no longer need to communicate with the database

Conclusion

In this article, we have introduced you to the close() method available to Mongoose connections. We have discussed how to use this method, what parameters it takes, and what its return value is. We hope this tutorial has been helpful in providing you with the necessary information to properly close connections between your Node.js application and MongoDB.