React developers use custom hooks to extract and share stateful logic between components, avoiding code duplication. A recent DEV Community article explains that custom hooks are JavaScript functions, not components, that must start with 'use'. They encapsulate logic like data fetching, which can then be reused across an application, making codebases cleaner and more maintainable.

The article contrasts a monolithic approach with a custom hook solution. Without hooks, developers often duplicate API call logic across components like UserProfile and UserSettings. Creating a single `useUserData` hook centralizes this logic. This means any change to the API endpoint or error handling only requires updating one file, preventing maintenance nightmares and reducing bugs.

Beyond data fetching, custom hooks offer significant flexibility. They can return multiple states, functions, or even JSX elements. However, they must follow strict rules: they only run inside functional components or other hooks. By mastering these tools, teams can split complex logic from UI rendering, leading to more organized and scalable React applications.