MongooseError: Mongoose.prototype.connect() no longer accepts a callback SOLVED in Node JS

If you are encountering the MongooseError stating that Mongoose.prototype.connect() no longer accepts a callback while working with Node JS, don’t worry! This error is easy to resolve with a simple update to your code.

In earlier versions of Mongoose, the connect() method accepted a callback as an optional parameter for handling connection events. However, in newer versions of Mongoose, the callback is no longer supported. This change was made to align with modern JavaScript practices and to simplify the usage of the connect() method.

How to solve the MongooseError:

To solve the MongooseError, all you need to do is remove the callback from the connect() method call. Here’s an example of how the code should be updated:

        
            // Old code
            mongoose.connect('mongodb://localhost/my_database', function(err) {
                if (err) {
                    console.error('Error connecting to MongoDB: ' + err.message);
                } else {
                    console.log('Connected to MongoDB');
                }
            });

            // Updated code
            mongoose.connect('mongodb://localhost/my_database')
              .then(() => {
                console.log('Connected to MongoDB');
              })
              .catch(err => {
                console.error('Error connecting to MongoDB: ' + err.message);
              });
        
    

By removing the callback and using the promises returned by the connect() method, you can easily handle connection success and error events in a cleaner and more modern way.

Conclusion

The MongooseError related to the connect() method no longer accepting a callback can be easily resolved by updating your code to remove the callback and use promises instead. By following the updated method of handling connection events, you can ensure compatibility with the latest versions of Mongoose and Node JS.