The singleton pattern ensures a class has only one instance and provides a global access point to it, useful for managing shared resources like database connections, caches, or configuration. As the creator of CoreUI with 26 years of JavaScript development experience, I’ve implemented singletons in large-scale applications to manage global state, coordinate logging systems, and ensure single database connection pools across millions of requests.

The most maintainable approach uses ES6 modules for natural singleton behavior or static properties for class-based singletons.