Top 30 Angular Interview Questions & Answers for Beginners – 2025

Angular is a powerful framework for building dynamic web applications. For beginners stepping into Angular development, it's crucial to understand the basics of components, modules, data binding, and services. Here's a curated list of top 30 beginner-level Angular interview questions and answers tailored for 2025.

Basic Angular Questions

• 1. What is Angular?
  Angular is a TypeScript-based open-source front-end web application framework developed by Google for building single-page applications.
• 2. What are components in Angular?
  Components are the basic building blocks of Angular applications. Each component controls a part of the UI.
• 3. What is a module in Angular?
  A module is a container that groups related components, directives, pipes, and services.
• 4. What is data binding in Angular?
  Data binding is the connection between the component’s data and the UI. It includes one-way and two-way binding.
• 5. What is a directive in Angular?
  Directives are instructions in the DOM. Angular provides built-in directives like *ngIf and *ngFor.

Angular CLI & Project Setup

• 6. What is Angular CLI?
  Angular CLI is a command-line interface tool that helps in creating, building, and maintaining Angular applications.
• 7. How do you create a new Angular project?
  Use the command: ng new project-name
• 8. How do you serve an Angular application?
  Run ng serve to compile and serve the application on a local development server.
• 9. What are the files generated by Angular CLI?
  Files like app.component.ts, app.module.ts, main.ts, and angular.json are generated.
• 10. What is the purpose of package.json in Angular?
  It manages project dependencies, scripts, and metadata.

Component and Template Basics

• 11. How do you create a component in Angular?
  Use the command: ng generate component component-name or ng g c component-name
• 12. What is interpolation in Angular?
  Interpolation allows embedding expressions into HTML using {{ }} syntax.
• 13. What is property binding?
  Property binding binds a property of a DOM element to a field in the component using [property].
• 14. What is event binding?
  Event binding listens to events like click using (event) syntax.
• 15. What is two-way data binding?
  It synchronizes data between the component and the view using [(ngModel)].

Services and Dependency Injection

• 16. What is a service in Angular?
  Services are used to write business logic and share data or functionality across components.
• 17. How do you create a service in Angular?
  Use the command: ng generate service service-name
• 18. What is dependency injection in Angular?
  It’s a design pattern used to inject dependencies like services into components.
• 19. How do you inject a service into a component?
  Import the service and add it to the constructor: constructor(private myService: MyService) { }
• 20. What is providedIn: 'root'?
  It makes the service available application-wide without registering it in the module.

Routing and Navigation

• 21. What is Angular routing?
  It enables navigation between different components using URL paths.
• 22. How do you configure routing in Angular?
  Use RouterModule.forRoot(routes) in the app module and define routes as an array of path-component mappings.
• 23. How do you navigate programmatically?
  Use this.router.navigate(['/path']) inside the component.
• 24. What is a router outlet?
  It’s a placeholder in the template where routed components are displayed using <router-outlet>.
• 25. What is the difference between routerLink and href?
  routerLink uses Angular routing for navigation; href performs a full page reload.

Miscellaneous

• 26. What is a pipe in Angular?
  Pipes transform output in the template. Example: {{ dateValue | date:'short' }}
• 27. What are lifecycle hooks in Angular?
  Methods like ngOnInit(), ngOnDestroy() that let you tap into the component life cycle.
• 28. What is the difference between ngOnInit and constructor?
  Constructor initializes class members; ngOnInit() is used for component initialization after inputs are set.
• 29. What is an observable in Angular?
  Observables are used to handle asynchronous operations and are provided by RxJS.
• 30. How do you handle forms in Angular?
  Angular provides Template-driven and Reactive Forms for handling form inputs and validations.