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How does Hydration work in modern Angular SSR, and what is non-destructive hydration?

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01

Understand the problem

Explain non-destructive hydration in Angular 17+ and how it differs from re-rendering.

ssrhydrationperformance
02

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03

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Non-destructive hydration reconciles the client-side state with the server-rendered DOM without tearing down and recreating it. It traverses the existing nodes, attaches event listeners, and hooks up reactivity, resulting in faster Largest Contentful Paint (LCP) and zero flickering.

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04

Read the code

Enabling Client Hydration during Bootstrap
import { bootstrapApplication, provideClientHydration } from '@angular/platform-browser';
import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  standalone: true,
  template: '<h1>Hydration Active</h1>'
})
export class AppComponent {}

bootstrapApplication(AppComponent, {
  providers: [
    provideClientHydration()
  ]
});
05

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