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Angular v17 Hydration Explained! 💻💦

Ever wished your Angular app could load faster, ace SEO, and dodge UI glitches? 🚀🪄 That's where Angular Hydration swoops in! Picture it like sending your app for a spa day – all that server-side goodness now chilling on the client's turf, saving you from redoing DOM nodes.

puppy is doing spa

What is Hydration?

  • Restores server-rendered apps on the client.
  • Reusing the DOM, preserving state, and transferring data from the server.

Why is it Important?

  • Boosts Performance: Reusing DOM nodes speeds up loading.
  • Enhances Core Web Vitals: Improves FID, LCP, and CLS.
  • Improves SEO: Ensures search engines get fully rendered content.
  • Prevents UI Issues: Avoids flicker and layout shift.

Enabling Hydration

  • Server-Side Rendering (SSR): Requires an SSR application.
  • Use provideClientHydration: In the main app component/module.
  • Bootstrapping: Include in both client and server providers.


  • DOM Structure of server and client must match.
  • No Direct DOM Manipulation to keep things smooth.
  • Mismatches in DOM structure can cause errors.

Handling Errors

  • Use ngSkipHydration: Temporarily bypass issues caused by DOM differences or direct manipulation.
  • Skipping Hydration for Components

Skipping Hydration for Components

  • Use ngSkipHydration for components incompatible with hydration.
  • Useful for components with DOM manipulation issues.


  • Internationalization (i18n): No support yet.
  • Third-Party Libraries: Some may need ngSkipHydration for compatibility.

And there you have it – a quick rundown of the essential facts to consider about Angular Hydration. Have you played around with Hydration yet? 😊

For more details, check out the Angular Documentation.

Top comments (1)

asimpson82 profile image

The guide on enabling hydration is quite helpful. From SSR to using provideClientHydration and bootstrapping in both client and server providers, it's a comprehensive approach.

Constraints are always crucial to be aware of. Ensuring the DOM structure alignment between server and client and avoiding direct DOM manipulation for smooth sailing make total sense. The mention of using ngSkipHydration for error handling is a neat trick.