Detailed Definition
Hydration is the client-side process where React reads the server-rendered HTML page and attaches JavaScript event handlers (like onClick) to make the page interactive.
Glossary HubProgramming
What is Hydration?
The React process of attaching event listeners to server-rendered HTML.
1 min read•Updated 2026-06-08
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Practical Example
Code/Output blockReact matching server HTML structure with client JS logic tree.
Why It Matters
Hydration allows fast initial content paints on screen, keeping SEO index crawlers happy while enabling fully responsive application behavior.
Common Use Cases
1
Activating input search filters in static page templates
2
Making mobile navigation menu drawers click-responsive
3
Initializing interactive sliders and accordion widgets
Frequently Asked Questions
It occurs when the client-rendered HTML structure differs from the server-rendered HTML structure.
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