100 Core Angular Interview Questions

Angular is a popular, dynamic web application framework developed by Google. It enables developers to create efficient, versatile applications with complex requirements. This blog post dives into pertinent Angular interview questions and answers, highlighting key topics like two-way data binding, dependency injection, components, and more. During tech interviews, questions about Angular assess a candidate’s understanding of framework knowledge and complex UI development. It’s essential for roles that require building interactive user interfaces and for those who aim to work in frontend development.

Content updated: January 1, 2024

Angular Fundamentals


  • 1.

    What is Angular and what are its key features?

    Answer:

    Angular is a robust, structural, TypeScript-based open-source front-end web application platform. It is especially well-suited for creating Single Page Applications (SPAs) and maintains a rich ecosystem of libraries, extensions, and tools.

    Core Features

    • Modularity: Through NG Modules, different parts of an Angular application can be structured and managed as distinct and cohesive units.

    • Component-based Architecture: Angular is built around components, fostering a modular, reusable, and testable design.

    • Directives: These markers on a DOM element instruct Angular to attach a particular kind of behavior to that element or even transform the element and its children.

    • Data Binding: Angular offers several types of data binding, enabling live management of data across the model, view, and components.

    • Dependency Injection (DI): Angular has its own DI framework, which makes it possible to get services and share data across components.

    • Templates: Enhanced HTML templates in Angular lead to seamless incorporation of specialized constructs, like directives and data binding.

    • Model-driven Forms: Angular approaches forms with modularity through custom NG modules, while also employing two-way data binding.

    • Template-driven Forms: Here, the emphasis is on minimizing the need for explicit model management on the component through directives that can observe and manage forms.

    • Inter-component Communications: Angular supports several methods for components to interact and share data, including Input, Output, ViewChild, and services based mechanisms.

    • Asynchronous Operations: Built on top of Promises, Observables offer a more flexible and powerful way to deal with sequences of events, HTTP responses, and more.

    • Directives: Angular comes with several built-in directives for management of the DOM, such as *ngIf, *ngFor, and *ngSwitch.

    • Advanced Routing: Angular’s powerful Router employs configurable routes, location services, and guards to navigate between views seamlessly.

    • Provisioning: The DI system in Angular centralizes the management of instances of services, ensuring singletons where necessary and other strategies based on the provider settings.

  • 2.

    Explain data-binding in Angular. What are the different types?

    Answer:
  • 3.

    Describe the Angular application architecture.

    Answer:
  • 4.

    What is a component in Angular and how is it used?

    Answer:
  • 5.

    What are directives in Angular and can you name a few commonly used ones?

    Answer:
  • 6.

    How do you create a service in Angular and why would you use one?

    Answer:
  • 7.

    Can you explain what dependency injection is in Angular?

    Answer:
  • 8.

    What is a module in Angular and what is its purpose?

    Answer:
  • 9.

    How do you handle events in Angular?

    Answer:
  • 10.

    What is two-way binding and how do you implement it in Angular?

    Answer:
  • 11.

    Explain the difference between an Angular component and a directive.

    Answer:
  • 12.

    What are Pipes in Angular and where would you use them?

    Answer:
  • 13.

    How do you handle form submissions in Angular?

    Answer:
  • 14.

    What is Angular CLI and what can it be used for?

    Answer:
  • 15.

    Describe how to make HTTP requests in Angular using HttpClient.

    Answer:
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