Angular 20 Features and Examples

Angular 20, released in late May 2025, marks a pivotal update in the Angular ecosystem, focusing on reactivity, performance, and developer experience. Below is a detailed breakdown of its most significant features, complete with code examples and practical implications.

Signals API Goes Stable

Angular 20 stabilizes the Signals API, a major leap toward fine-grained reactivity. Signals are reactive primitives similar to React’s useState or Vue’s refs, enabling state updates that only re-render what’s necessary.

Example:

import { signal } from '@angular/core';

const counter = signal(0);

function increment() {
  counter.set(counter() + 1);
}

This makes state management simpler and more predictable, reducing the need for RxJS in many scenarios.

Zoneless Change Detection (Developer Preview)

Angular 20 introduces experimental support for zoneless change detection, allowing developers to opt out of Zone.js. This results in:

• Smaller bundle sizes (no Zone.js dependency)
• Faster change detection cycles
• Cleaner stack traces for easier debugging

How to enable:

import { provideZonelessChangeDetection } from '@angular/core';

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

Manual change detection can be done via ChangeDetectorRef or by leveraging Signals for automatic UI updates.

Reactive API Improvements: Effect and Resource APIs

• Effect API: Automatically manages side effects in response to signal changes.
• Resource API: Simplifies handling of asynchronous operations, tying async data directly to signal-based state.

Example:

import { effect, signal } from '@angular/core';

const userId = signal(1);

effect(() => {
  // Fetch user data whenever userId changes
  fetchUser(userId());
});

This enables more declarative and maintainable code for state and side effects.

Signal-Based Forms (Experimental)

Angular 20 introduces experimental signal-based forms, aiming for unified reactivity and efficient state management in forms.

Features:

• Real-time validation via computed signals
• Scalable for complex forms

Example:

import { signal } from '@angular/core';

const name = signal('');
const isValid = computed(() => name().length > 2);

Form controls and validations update reactively, improving UX and code clarity.

Selectorless Components

Angular 20 allows for selectorless components, streamlining imports and reducing boilerplate. This improves ergonomics for standalone and dynamically created components, making refactoring easier.

Incremental Hydration and Flexible Rendering

• Incremental Hydration: Improves Largest Contentful Paint (LCP) and SEO by only hydrating visible parts of the page.
• Flexible Rendering Modes: Developers can choose rendering strategies to optimize performance.

Example:

@Component({
  selector: 'my-component',
  template: `
    @defer { ... }
  `
})
export class MyComponent {}

This leverages the @defer directive for faster initial loads and better SEO.

Accessibility Enhancements

Angular 20 introduces accessibility primitives and real-time CLI warnings, making it easier to build inclusive applications and catch issues during development.

Improved Testing Facilities

• Karma Deprecated: Angular 20 moves away from Karma, introducing experimental support for Web Test Runner and Vitest, both of which are faster and more modern.
• Example: No code required—just select the new test runner in your Angular CLI setup.

Router Improvements

• Scroll Options: Native scroll behaviors now supported.
• Resolvers: Child resolvers can access parent route data.
• Async Redirects: redirectTo can now return Promises or Observables.
• Custom Elements: Use custom elements as hosts for RouterLink.

Example:

this.scroller.scrollToPosition([0, 10], { behavior: 'smooth' });

provideRouter([
  { path: 'users/:id', resolve: { user: userResolver }, children: [
    { path: 'posts', resolve: { posts: postsResolver }, component: UserPosts }
  ]}
]);

Two-Way Binding for Dynamically Created Components

Angular 20 now supports two-way data binding for components created at runtime, making dynamic UIs (like modals and form generators) much easier to manage[6].

Smaller Bundles and Faster Load Times

• Improved tree-shaking aggressively removes dead code.
• Ivy compiler enhancements reduce memory usage and rebuild times.

Summary Table: Angular 20 Key Features

Angular 20 is a transformative release, making Angular apps more reactive, performant, and developer-friendly. For enterprise teams and solo devs alike, these features offer new ways to build scalable, modern web applications.