Mongoose: Server Discovery And Monitoring Engine is Deprecated

Updated: December 31, 2023 By: Guest Contributor Post a comment

With the evolution of database drivers, Mongoose has deprecated its traditional Server Discovery and Monitoring (SDAM) engine. This tutorial covers updating code and practices to align with the latest standards.

Understanding SDAM Deprecation

Deprecation of SDAM in Mongoose means a shift towards new best practices for database connection and monitoring. Understand how this affects your existing applications and how to migrate.

// Old SDAM usage
mongoose.connect('mongodb://localhost:27017/myapp', {
  server: { poolSize: 5 }

// New SDAM usage (Update according to the latest specifics)
mongoose.connect('mongodb://localhost:27017/myapp', {
  newUrlParser: true,
  useUnifiedTopology: true

Configuring the Connection Pool

Adjust the connection pooling using the new options provided by the updated Mongoose driver to optimize performance.

// Basic connection pool config
mongoose.connect('mongodb://yourMongoDBUri', {
  newUrlParser: true,
  useUnifiedTopology: true,
  poolSize: 5 // Adjust the pool size

Error Handling

Learn the modern approach to handle errors and maintain robustness in your database interaction layer.

// Example with modern error handling
db.on('error', console.error.bind(console, 'MongoDB connection error:'));

Monitoring Database Events

Implement event listeners to effectively monitor various database events using the new API.

// Monitoring events with the new syntax
db.on('connected', () => {
  console.log('Mongoose connected to DB cluster');

Advanced Configuration

Dive into advanced configuration options to fine-tune your Mongoose setup.

// Example of advanced configuration with Mongoose
mongoose.connect('mongodb://yourMongoDBUri', {
  newUrlParser: true,
  useUnifiedTopology: true,
  // Other configuration options

Migrating Your Code

This section provides step-by-step instructions to transition older Mongoose code to the latest syntax.

// Sample migration code snippet
db.on('fullsetup', () => {
  console.log('All nodes are set up');

Updating Models

Understand necessary updates to your Mongoose schemas and models to ensure compatibility.

// Updating a model
const User = mongoose.model('User', new mongoose.Schema({
  name: String,
  // define other model-spec properties

Transition Strategies

Strategize the transition process for large-scale applications, including tips for testing and gradual rollout of changes.

// Discuss strategies for transitioning
console.log('Implement your transition strategies here.');

Common Pitfalls

Highlight typical mistakes during the migration process and provide advice on how to avoid them.

// Pitfall example snippet
// Correct handling of the pitfall
console.log('Correct your code based on the discussed pitfalls.');

Best Practices for the Future

Prepare for the future by adopting best practices today. This part delves into coding standards that will ease future transitions.

Dynamic Configuration

Learn to utilize dynamic configurations to make your application adaptable to change.

// Dynamic configuration example
const dbConfig = { newUrlParser: true, useUnifiedTopology: true };
mongoose.connect('mongodb://yourMongoDBUri', dbConfig);

Regular Updates

Emphasize the importance of keeping dependencies updated to avoid the impact of deprecations.

// Sample script to keep dependencies updated
console.log('Script to update dependencies regularly');

Testing and Quality Assurance

Stress the role of a thorough testing pipeline to ensure smooth operation throughout updates and changes.

// Setup a testing pipeline
console.log('Establish a comprehensive testing pipeline for your application.');


The deprecation of Mongoose’s SDAM is a step towards modernizing applications. By following this guide, you have updated your projects and ensured they remain sustainable and performant.