React 19 Development Patterns

Overview

React 19 patterns for Next.js App Router, Server Actions, optimistic UI, and concurrent features. See Quick Reference for API summary and Examples for copy-paste patterns.

When to Use

• Building React 19 applications with Next.js App Router
• Implementing optimistic UI with useOptimistic or useTransition
• Creating Server Actions with form validation
• Migrating from class components to hooks
• Optimizing concurrent rendering with React Compiler
• Managing complex state with useReducer or custom hooks
• Wrapping async operations in Suspense boundaries

Quick Reference