Architectural Mastery in Node.js: Designing a Robust, Multi-Platform NPM Package

A developer guide outlines a cross-platform Node.js utility to resolve EADDRINUSE by finding and killing processes that hold busy ports.

The package uses platform-specific commands such as lsof, netstat, and taskkill to handle macOS, Linux, and Windows.

Strategy and Factory patterns separate OS-specific logic from orchestration, making the tool cleaner, testable, and easier to extend.

The approach avoids brittle process.platform branching and offers a maintainable model for cross-platform NPM packages.