React Hydration Errors in Server-Side Rendering: Causes and Solutions
This article delves into the common hydration errors encountered in React server-side rendering (SSR). Using a simple React/Express app example, it demonstrates how hydration errors occur: when the HTML initially rendered by the server doesn't match the component structure React expects during client-side hydration. The article thoroughly explains the difference between `hydrateRoot` and `createRoot`, and provides multiple solutions, including verifying consistency between server and client renders, handling browser-specific APIs, and using `useEffect` to prevent rendering before hydration completes. It also highlights the importance of avoiding invalid HTML and handling browser environment specifics like localStorage. The ultimate goal is ensuring consistent server and client renders to avoid hydration errors and improve user experience.
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