Angular (Modern) Compiler

What Is the Angular (Modern) Online Compiler?

The Angular (Modern) Online Compiler is a browser-based playground for Angular 15+ component development. It provides three editor panels for your template HTML, component class logic, and component styles. Angular is loaded via ESM CDN imports with the JIT compiler, so you can test Angular template syntax, property binding, event handling, structural directives like *ngFor and *ngIf, and interpolation without installing the Angular CLI or setting up a local project.

How It Works

1. Write your Angular template HTML in the Template editor panel using Angular syntax like interpolation, property binding, and structural directives.
2. Define your component class methods and properties in the Component Class editor panel.
3. Add scoped CSS styles in the Styles editor panel.
4. Click the Run button in the header toolbar.
5. The compiler builds an iframe that loads Angular 15 core modules via ESM CDN along with Zone.js and Reflect metadata polyfills.
6. A standalone component is created by manually applying the @Component decorator, then bootstrapped with bootstrapApplication. The output renders in the preview panel.

Step-by-Step Example

Follow these steps to create a simple counter component:

1. In the Template editor, write <h1>{{ title }}</h1> followed by <p>Count: {{ count }}</p> and a <button (click)="increment()">Increment</button>.
2. In the Component Class editor, add a constructor that sets this.title = "My App" and this.count = 0.
3. Add an increment() method that does this.count += 1.
4. In the Styles editor, add CSS for the card container, heading, and button to style the component.
5. Click Run to see the result. The counter renders in the output and clicking the button increments the count.

Use Cases

• Learning Angular templates — Practice interpolation, property binding, event binding, and structural directives without a full CLI setup.
• Prototyping components — Quickly build and iterate on Angular component templates and styles before adding them to a real project.
• Testing directives — Experiment with *ngFor, *ngIf, [ngClass], [ngStyle], and other built-in directives.
• Comparing frameworks — Try Angular template syntax side by side with React, Vue, or Svelte using the other compilers on this site.
• Teaching — Demonstrate Angular component concepts in workshops or online courses with zero student setup required.

Limitations & Notes

• This is a template playground, not a full Angular CLI environment. Multi-file projects are not supported.
• The component class is written in plain JavaScript, not TypeScript. Decorators are applied programmatically.
• Services, dependency injection, and providers have limited support in this sandbox.
• The Angular Router is not loaded. This is a single-component environment.
• RxJS is available at a basic level since Angular depends on it, but complex operator chains may not work.
• Angular modules load via ESM CDN (esm.sh), so an internet connection is required and initial load may be slow.
• Code is not saved between sessions. Copy your work before navigating away.

Sources & References

• Angular official documentation — angular.io
• Angular CLI reference
• Angular template syntax guide
• TypeScript documentation
• MDN Web Components

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