In recent years, Angular has taken big steps toward simplifying app structure and improving runtime performance. With Angular Standalone Components and the new Signal API, developers can now build apps that load faster, run smoother, and are much easier to maintain.
In this article, we’ll understand what these features are, why they matter, and how you can use them together to build blazing-fast, modern Angular apps.
🧩 1. What Are Standalone Components?
Traditionally, every component in Angular had to belong to an NgModule.
But from Angular 14 onwards, and now fully stable in Angular 17+, you can create Standalone Components — meaning they don’t need to be declared inside a module.
This makes your app lightweight, modular, and faster to bootstrap.
✅ Example: Creating a Standalone Component
import { Component } from '@angular/core';
import { CommonModule } from '@angular/common';
@Component({
selector: 'app-dashboard',
standalone: true,
imports: [CommonModule],
template: `<h2>Welcome to Dashboard!</h2>`
})
export class DashboardComponent {}
No @NgModule needed!
You can directly use this component in routing or even bootstrap it in main.ts.
⚙️ 2. Bootstrapping with Standalone Components
With standalone components, even your AppModule becomes optional.
Example:
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app/app.component';
bootstrapApplication(AppComponent)
.catch(err => console.error(err));
That’s it — no AppModule required!
This reduces overhead and speeds up the app’s initial load time.
🔄 3. Angular Signal API – The Game Changer
The Signal API, introduced in Angular 16+, is a powerful new way to manage reactive state without complex libraries like RxJS or NgRx.
Signals are reactive variables that automatically update the UI whenever their value changes.
✅ Example: Simple Counter Using Signal
import { Component, signal } from '@angular/core';
@Component({
selector: 'app-counter',
standalone: true,
template: `
<h2>Count: {{ count() }}</h2>
<button (click)="increment()">Increment</button>
`
})
export class CounterComponent {
count = signal(0);
increment() {
this.count.update(c => c + 1);
}
}
No BehaviorSubject, no subscriptions — just simple, reactive code.
🧠 4. How Signals Improve Performance
With traditional change detection, Angular re-renders components unnecessarily.
Signals fix this by using fine-grained reactivity — only updating parts of the UI that actually change.
This means:
Less re-rendering
Better performance
Cleaner codebase
🧭 5. Combining Standalone Components and Signals
Together, Standalone Components and Signals make Angular apps simpler and more efficient.
Here’s an example of how both can be used in a real-world scenario like a Product Dashboard.
Example: Product Dashboard with Reactive State
import { Component, signal } from '@angular/core';
import { CommonModule } from '@angular/common';
@Component({
selector: 'app-product-dashboard',
standalone: true,
imports: [CommonModule],
template: `
<h1>Product Dashboard</h1>
<input type="text" placeholder="Search product..." (input)="search($event)">
<ul>
<li *ngFor="let p of filteredProducts()">{{ p }}</li>
</ul>
`
})
export class ProductDashboardComponent {
products = signal(['TV', 'Fridge', 'Laptop', 'Fan', 'Microwave']);
filteredProducts = signal(this.products());
search(event: any) {
const keyword = event.target.value.toLowerCase();
this.filteredProducts.set(
this.products().filter(p => p.toLowerCase().includes(keyword))
);
}
}
Join the conversation! Your thoughts help the community grow.