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Rendering Strategies

Angular supports multiple rendering strategies to optimize for SEO, performance, and interactivity.

1. Client-Side Rendering (CSR)

Default Strategy. Content is rendered entirely in the browser.

  • Use case: Interactive dashboards, internal tools.
  • Pros: Simplest to configure, low server cost.
  • Cons: Poor SEO, slower initial content visibility (must wait for JS).

2. Static Site Generation (SSG / Prerendering)

Content is pre-rendered into static HTML files at build time.

  • Use case: Marketing pages, blogs, documentation.
  • Pros: Fastest initial load, excellent SEO, CDN-friendly.
  • Cons: Requires rebuild for content updates, not for user-specific data.

3. Server-Side Rendering (SSR)

Content is rendered on the server for the initial request. Subsequent navigations happen client-side (SPA style).

  • Use case: E-commerce product pages, news sites, personalized dynamic content.
  • Pros: Excellent SEO, fast initial content visibility.
  • Cons: Requires a server (Node.js), higher server cost/latency.

Hydration

Hydration is the process of making server-rendered HTML interactive in the browser.

  • Full Hydration: The entire app becomes interactive at once.
  • Incremental Hydration: (Advanced) Parts become interactive as needed using @defer blocks.
  • Event Replay: Captures and replays user events that happened before hydration finished.

Decision Matrix

Requirement Strategy
SEO + Static Content SSG
SEO + Dynamic Content SSR
No SEO + High Interactivity CSR
Mixed Hybrid (Route-based)