1 React Dark Mode Examples

November 20, 2025 by Vladimir 1 min read

This collection explores best practices for implementing Dark Mode in React applications, covering a wide range of architectural approaches. Whether using the Context API, CSS variables, or CSS-in-JS libraries, the focus is on seamless state management and persisting user settings across sessions. It addresses critical aspects such as auto-detecting system preferences (prefers-color-scheme) and preventing the jarring “flash of incorrect theme” (FOUC) on load. These are robust, scalable patterns designed to ensure a consistent user experience in any production project.

Examples

Collapsible React Sidebar with Dark Mode

A collapsible React sidebar featuring a smooth shrink transition and integrated dark mode toggle managed via useState hooks and CSS Custom Properties. The component utilizes SCSS loops for staggered list animations and conditional rendering to seamlessly adapt the layout between full-width and icon-only states, while global theme variables ensure instant restyling across the entire DOM.

See the Pen Collapsible React Sidebar with Dark Mode.