software

Hydration

Definition

Hydration is the process of attaching JavaScript event handlers and state to server-rendered HTML in the browser, making a static page interactive. Full hydration re-processes all components; partial hydration (islands architecture, used by Astro) only hydrates interactive components.

Hydration overhead is a primary cause of Time-to-Interactive performance issues in SSR frameworks.

Related Terms

SSR

Server-Side Rendering

SPA

Single-Page Application

SSG

Static Site Generation

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