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React 18 introduces Streaming SSR and Selective Hydration, enabling faster initial page rendering and more efficient hydration by only rendering necessary components.
This article provides a comprehensive overview of React 18, covering its release timeline, migration steps, new APIs such as the root API, useId, useSyncExternalStore and useInsertionEffect, automatic state batching, flushSync, updated Strict Mode and Suspense behavior, concurrent mode concepts, and practical code examples for developers upgrading from React 17.
This article explains React 18’s four major innovations—Automatic Batching, Concurrent APIs, Server‑Side Rendering for Suspense, and the new Render API—showing how they improve rendering performance, enable concurrent UI updates, and simplify hydration in modern web applications.
The React team has open‑sourced the Scheduling Profiler, a new tool that extends the classic Profiler by visualizing component scheduling, priority handling, transitions, and Suspense behavior, helping developers diagnose rendering delays and optimize performance in React 18 applications.
This article explains why React keys are crucial when rendering lists, demonstrating through a dynamic form example how using array indices as keys can cause bugs when items are added or deleted.
This guide explains how to migrate a React server‑side rendering setup to React 18 by installing the latest version, replacing renderToString with pipeToNodeWritable, and adopting the new API surface while handling Suspense and streaming nuances.
React 18 extends StrictMode with Strict Effects, causing newly mounted components to run their effects twice in development to surface hidden bugs, while offering guidance on when to enable or disable this behavior for reliable UI state management.
This article explains the differences between React 18’s legacy ReactDOM.render root API and the new ReactDOM.createRoot API, covering concepts of roots, hydration, rendering callbacks, and why both APIs are maintained, with code examples for each approach.
React 18 introduces automatic batching that merges multiple state updates into a single render across all contexts—including promises, timeouts, and native events—improving performance while offering opt‑out mechanisms like flushSync for rare cases where immediate DOM updates are required.
React 18 introduces a progressive upgrade path with concurrent rendering, automatic batching, a new Root API, startTransition, and an improved Suspense SSR architecture, allowing developers to adopt new features with minimal code changes while enhancing performance and enabling selective hydration and streaming HTML.