Master advanced Node.js patterns, performance optimization, memory management, and debugging techniques for production applications.
Learn common design patterns and their implementation in Node.js applications including Singleton, Factory, Observer, and Middleware patterns.
Learn advanced performance optimization techniques including caching strategies, database query optimization, and connection pooling.
Understand Node.js memory management, garbage collection, and memory leak prevention with monitoring tools and optimization techniques.
Master advanced debugging techniques, profiling, and troubleshooting for Node.js applications with comprehensive logging and monitoring.
// Singleton Pattern - Database Connection
class DatabaseConnection {
constructor() {
if (DatabaseConnection.instance) {
return DatabaseConnection.instance;
}
this.connection = null;
this.isConnected = false;
DatabaseConnection.instance = this;
}
async connect() {
if (this.isConnected) {
return this.connection;
}
try {
this.connection = await mongoose.connect(process.env.MONGODB_URI, {
useNewUrlParser: true,
useUnifiedTopology: true,
maxPoolSize: 10,
serverSelectionTimeoutMS: 5000,
socketTimeoutMS: 45000,
});
this.isConnected = true;
console.log('Database connected successfully');
return this.connection;
} catch (error) {
console.error('Database connection failed:', error);
throw error;
}
}
}
// Usage
const db1 = new DatabaseConnection();
const db2 = new DatabaseConnection();
console.log(db1 === db2); // true - same instance