How to Use the Latest Version of React (React 19) to Build Web Apps

React 19 is the latest major release, and it changes how you write everyday components. Here is a practical path to start a new project and adopt the newest features without overcomplicating your stack.

Step 1: Scaffold the Project with Vite

Vite remains the fastest way to start a React 19 app. Run npm create vite@latest my-app -- --template react, then npm install and npm run dev. You get JSX, hot module reloading, and a production build with almost no configuration.

Step 2: Replace Form Boilerplate with Actions

React 19 introduces Actions — async functions you pass directly to forms. They remove most manual loading and error state.

• useActionState tracks pending and error states
• useFormStatus reads submission status in child components
• useOptimistic shows instant UI before the server responds

Step 3: Fetch Data with the use() Hook

The new use() hook reads a promise inside a component. Wrap the tree in <Suspense> and an Error Boundary, and React handles the loading and failure states for you.

Step 4: Let the React Compiler Optimize

The React Compiler memoizes components automatically at build time. In most codebases you can delete manual useMemo and useCallback calls and keep writing plain functions.

Conclusion

Start with Vite, migrate one form to Actions, then try use() and the compiler. Upgrade incrementally, and React 19 will feel like less code, not more.