Uninstalling npm packages removes unnecessary dependencies from your Node.js project, reducing bundle size and maintaining clean dependency management. As the creator of CoreUI, a widely used open-source UI library, I’ve managed package dependencies across hundreds of Node.js projects, regularly cleaning up unused packages for optimal performance. From my expertise, the most effective approach is using npm uninstall with proper flags to remove packages from both node_modules and package.json. This method ensures complete package removal and maintains accurate dependency tracking for project consistency.