React Hydration: Bringing Server HTML to Life
Hydration turns static, server-rendered HTML into a fully interactive React app. It's the core of Server-Side Rendering (SSR), where the client "wakes up" the initial HTML by attaching event listeners.
React hydration turns static, server-rendered HTML into a fully interactive application. The server sends a lifeless HTML "mannequin" for a fast view; hydration is the client-side process that attaches React's brain and event listeners. This is key to SSR in frameworks like Next.js, providing fast content then adding interactivity. The main footgun: the client-rendered output must perfectly match the server's HTML, or you'll get hard-to-debug errors.
Read the original → react.dev
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