How do you close a database connection in Node.js?connection.stop()connection.terminate()connection.close()connection.end()

To close a database connection in Node.js, you would typically use the connection.end() method. Here are the steps:

1. First, ensure that you have an active database connection. This is usually stored in a variable, often named connection or db.

2. Call the end() method on this connection object. This initiates a graceful termination of the connection. Here's how you can do it:

connection.end(function(err) {
  if (err) {
    return console.log('error:' + err.message);
  }
  console.log('Close the database connection.');
});

In this code, connection.end() is called to close the database connection. The function passed as an argument to end() is a callback that will be executed once the connection is successfully terminated. If there's an error during this process, it will be logged to the console. Otherwise, a success message is logged.

Remember, it's important to always close connections when you're done with them, as failing to do so can lead to memory leaks and other potential application issues.