Angular - Standalone Component

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This Angular chapter will discuss the Standalone component, including when it was introduced by the Angular team, its advantages, how to create standalone components and more.

Standalone Components in Angular

In Angular, Standalone components provide a simplified way to build Angular applications. As the name suggests, standalone components are independent and do not rely on other modules or components.

Note! Yes, standalone components are independent; they no longer depend on the @NgModule. If you try to import a standalone component into an @NgModule, you might encounter errors

Important! The Standalone components were introduced in Angular version 14. Learn more about Angular's various versions: See more

Standalone components are suitable for small applications that do not require module dependencies. However, when developing a large or complex application with mandatory dependencies for components, this becomes a drawback for standalone components.

Important! Any existing angular applications can optionally and incrementally adopt the new standalone style without any breaking changes.

Standalone vs Non-Standalone Components

Below is a list which differentiate between standalone and non-standalone component:

How to Create a Standalone Component?

To create an standalone component in your angular application, you need to run the following command:

ng generate component component_name

In the latest version of Angular, this command will automatically create a standalone component, as the application itself supports standalone components by default.

However, in older versions of Angular, running the above command may not create a standalone component. In that case, we need to use the following command or manually set the standalone property and specify the imports.

ng generate component component_name --standalone

The standalone component initial data will look like:

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

@Component({
  selector: 'app-root',
  standalone: true,
  imports: [],
  templateUrl: './app.component.html',
  styleUrl: './app.component.css'
})
export class AppComponent{
  title = 'my-crud-app';
}

Here,

• The standalone: true property identifies this component as a standalone component.
• The imports array is where you can add all the required dependencies for this component.

Verify the Standalone Components

You might be wondering how to determine if a component is standalone. To verify if a component is standalone in Angular, you can check using the following guide lines:

• Standalone Property: Check the standalone property in the component's TypeScript file (.ts file). If the standalone property is set to true, then it's a standalone component.

@Component({
  selector: 'app-root',
  standalone: true,
  imports: [],
  templateUrl: './app.component.html',
  styleUrl: './app.component.css'
})

Importing Standalone Component: If you try to import the standalone component into a non-standalone module, it should throw an error:

Component imports must be standalone component

Advantages of Standalone Components

Below is a list of some advantages of the Standalone components:

• Reusability: These components are self-contained, making them easy to reuse in different parts of the application without any module dependency.
• Faster Development: As there is no need to import within the modules, developers can quickly create and integrate new components, speeding up the development process.
• Modularity: The Standalone components enable a modular approach, allowing for better organization and maintainability of the codebase.