The original title is "The Everyday Backend Engineer: Step 1 — The Singleton Pattern"

Short summary

A beginner-friendly introduction to the Singleton pattern for backend engineers, using database connection pooling in Node.js as the practical example. It explains why creating a new connection per request crashes servers under load and shows how Node.js module caching naturally implements Singleton behavior. The article includes working code for a frozen, shared database pool instance.

• •Singleton pattern ensures one shared instance of a resource like a DB connection pool
• •Node.js module caching (require/import) provides Singleton behavior natively
• •Code example shows a frozen DatabaseConfig instance shared across controllers

Generated with AI, which can make mistakes.