10 AngularJS Developer interview questions and answers

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What is AngularJS and what are some of its advantages?

This question might seem basic at first glance, but what you’re really doing is giving the developer a chance to show you what they know about your chosen framework. AngularJS is a powerful JavaScript-based development framework designed to create dynamic single-page applications with fewer lines of code. Some of the key advantages that you’ll want to look for in their response are listed below.

  • Data binding is as easy as writing in your code.
  • AngularJS was made for CRUD applications, which happen to represent the majority of web apps (excluding DOM manipulation-intensive applications like games and GUI editors).
  • It separates DOM manipulation from app logic, making code modular and easy to test.
  • It's a comprehensive client-side solution in that it decouples the client-side from server-side development effort.
  • It saves months of development time by freeing the developer from having to write repetitive low-level DOM manipulation tasks, manually registering callbacks, and otherwise automating most AJAX application tasks.
  • It’s great for providing a “desktop-like” experience to the end user.

What is the Model View Controller (MVC)?

MVC is a common design pattern used in developing software that consists of three parts: the model, view, and controller. The model is the lowest level of the pattern and is responsible for maintaining data. The view is the part of the application that is presented to the user. The controller is the code that governs all interactions between the model and the view.

What is data binding in AngularJS? How does it relate to the MVC architecture?

In most templating systems, data binding is unidirectional. When the model and template components are merged together, it creates a view. However, the developer must write code to constantly synchronize the model and the view. AngularJS uses two-way data binding, where any changes to the view will automatically update the model and vice versa. The view is more or less just a projection of the model, which greatly simplifies things from the programmer’s perspective.

Explain the concept of scope. How does scope inheritance work in AngularJS?

Scope is an object that represents the data-model of an AngularJS application—it is the glue between the view and the application controller. Scope inheritance closely mimics the DOM structure of the application. With the exception of isolated scopes created using custom directives, scopes follow prototypal inheritance. The code block below demonstrates typical scope inheritance.

  var myApp = angular.module("myApp", []);

  myApp.controller("fruitController", function($scope) {
    $scope.message = "This is a Fruit";
    $scope.type = "Fruit";

  myApp.controller("appleController", function($scope) {
    $scope.message = "This is an Apple";

The important thing to note in the above example is that values have been set to models in fruitController, and the message in appleController has been overridden.

Explain the difference between a factory and a service in AngularJS.

AngularJS encourages developers to store business logic and persistent data separately from controllers and scopes within an application, by providing factories and services. To understand the difference, let’s take a look at the code block below.

// The code below is a service.
app.service('MyService', function () {
  this.helloWorld = function () {
    console.log('Hello World');

// The code below is a factory.
app.factory('MyService', function () {
  return {
    helloWorld: function () {
      console.log('Hello World');

While syntactically distinct, the above examples perform the same task of printing “Hello World” to the console. The conceptual difference you'll want to look for in the applicant’s answer however, is that a service is a constructor function while a factory is a function that must be called. This is why the service can use the “this” keyword while a factory must explicitly return the object that it creates. An even better answer would also reveal that a service is actually calling a predefined factory deep within the Angular.js file loaded into all AngularJS applications. Check out this code snippet from the Angular.js file.

// By calling service() you are also calling a predefined factory() within AngularJs
function service(name, constructor) {
  return factory(name, ['$injector', function($injector) {
    return $injector.instantiate(constructor);

Explain why there are two “destroy” events associated with the termination of a scope in AngularJS.

The first $destroy is an AngularJS event associated with components like controllers or link functions. The second is actually a jqLite/jQuery event associated with the removal of a node, which may occur without a scope teardown.

What is dependency injection and how does it work?

AngularJS was designed to highlight the power of dependency injection, a software design pattern that places an emphasis on giving components their dependencies instead of hard coding them within the component. For example, if you had a controller that needed to access a list of customers, you would store the actual list of customers in a service that can be injected into the controller instead of hardcoding the list of customers into the code of the controller itself. In AngularJS you can inject values, factories, services, providers, and constants.

What are directives? Can you explain the functions of the following directives?





Directives are used by AngularJS to extend the functionality of HTML by adding new attributes with the ng- prefix. The four directives listed above are some of the more important ones every AngularJS developer should know by heart.

  • The ng-app directive can be placed within a element to make it the root element of an AngularJS application.
  • The ng-model directive binds the value of HTML controls to application data.
  • The ng-bind directive binds the content of an HTML element to application data.
  • The ng-controller directive defines the controller object for an application.

Explain the role of $routeProvider in AngularJS.

The $routeProvider is used to configure roots within an AngularJS application. It can be used to link a url with a corresponding HTML page or template, and a controller (if applicable).

How experienced are you with e2e testing? Explain how e2e testing of AngularJS applications works.

End-to-end (e2e) testing is the practice of testing an application from start to finish to determine whether all the components are working together properly. If unit tests are the first line of defense against bugs within the individual components, e2e testing can be thought of as the safety net that catches issues related to integration and flow within an application. The AngularJS team built Protractor, a Node.js application that can simulate user interactions and help developers test the overall health of their AngularJS applications. It’s a good idea to ask an applicant about past experiences using Protractor to perform e2e testing on AngularJS applications.



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    Ali A.
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    I've studied computer science. I have an experience of Web Development with the flavor of HTML, CSS, Bootstrap, JavaScript and other web development tools. I really enjoy this fact that thousands of users use applications that are developed by me. The ultimate dream is that one-day thousands will grow into millions or billions. I HAVE A DREAM! Overall if summarized my experience that would be exploring, organizing information, problem-solving and implementation. Languages are essential for expressing your programming skills overall. From EXPLORING attribute I have worked around lots of different languages. 1) Ruby 2) AngularJS 3) Javascript 4) Python ( a new sensation I always wanted to explore Erlang but then I found this beauty. Python leverages the Erlang VM, known for running low-latency, distributed and fault-tolerant systems, while also being successfully used in web development and the embedded software domain.) In assistance to above languages below frameworks come into play, 1) Ruby on Rails 2) Laravel 3) Django Databases are the main central storage of any web application. I got experience in both SQL and NoSQL 1) Postgres 2) MongoDB 3) SQLite 4) Mysql The game never ended on the server side for me. Frontend/public facing part of the web application has been also highly evolved. Everyone wants to use Single Page Applications - The SPAs. I got experience in the following 1) Angular JS 2) React JS Testing and Test Driven Development(TDD) is also an essential thing for any solid applications. I can write automated tests in following 1) Rspec 2) Capybara 3) Mocha Deployment is essential to distribute your application out in the wild. I got experience in the following tools and technologies 1) AWS 2) Google Cloud Platforms 3) Capistrano 4) Mina 5) Nginx 6) Passenger Phusion 7) Puma 7) Unicorn
  • $20 hourly
    Karan S.
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    vsuc_fltilesrefresh_TrophyIcon AngularJS
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    75+ Projects, $30K+ Total Earnings, 2100+ Hrs Worked 7+ Years of Experience in Web & E-commerce Development, Shopify Apps Development, Shopify Store, Shopify Plus, Magento 2.X, Woo-Commerce Expert on UpWork. Over the past years, I have developed a wide range of websites, eCommerce stores design and development using Shopify & Shopify Plugin, WooCommerce, & Magento 2.x. Also, I created various Shopify (Public and Private). I do have excellent expertise in HTML5/CSS3, Twitter Bootstrap, Javascript, jQuery, PHP, MySQL. Also have expertise in Custom eCommerce CMS, Blog design & development, Plugins, Theme Integration, Theme Development from PSD/HTML/CSS pages, Theme Customization, Plugin integration & Customization, SEO friendly website. Key Skills in Shopify: - Shopify Store Setup & Configuration - Responsive Shopify Theme Design (Customizable Templates, Polaris Based Designing) - Customized Shopify Store - Shopify App Development - Shopify Store SEO - Shopify Migration Services (from Magento and WooComerce and Prestashop) - API Integration, Module & Plug-in Management - Shopify Maintenance & Support Key Skills in Shopify APPs (Public & Private Apps): - Shopify APPs using ROR framework, Node, PHP or third-party app integration, - Shopify ADMIN APIs - GraphQL Admin API - Storefront API - Embedded apps - GDPR requirements - Sell through the Checkout API - Managing fulfillment with the Fulfillment and FulfillmentService resources - Updating inventory (Auto-Updates ), Sync with ERPs (Xero, QuickBooks) via CSV - Localization - Supporting multi-language online stores Key Skills in Magento: - Magento 1 to Magento 2 migration - Magento Store Setup & Configuration - Magento theming from PSDs/AdobeXD/Sketch/InDesign/Figma - Magento Extension and Module development - Magento Speed enhancements - Magento Commerce enhancements - Inventory/Attribute/Category loads into Magento - Magento Store Maintenance - Magento AWS Server Setup Other Skills : - ECommerce: Shopify, Magento (1.x & 2.x), Woo-Commerce, Big-Commerce, PrestaShop - Expertise in Custom Extensions / Plugin Development & Customization - Experience in PHP, ROR Development - Experience with HTML5/CSS3 - Design: XHTML, HTML, DHTML, CSS, JAVASCRIPT - JavaScript: AJAX, JQUERY, EXTJS, YUI, JSON/XML Data Attributes - Expertise: PHP, MySQL, MongoDB - Responsive Website Design - Twitter BootStrap, Initializer, HTML5 Boilerplate , HTML5 Grids - HTML5, CSS3, jQuery, jQuery UI, Widgets - Experience on JSON/REST API, XML Data Parsing - Solid understanding of web standards, semantics and cross-browser issues and solutions - Payment gateways also like P ayPal, Google Checkout, Braintree, Stripe, Authorize.net, CC Avenue etc - SEO knowledge and experience
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    ⭐ 60k+ earning history with 5 START RATINGS in ALL JOBS ⭐ ⭐ Available more than 40 hours per week ⭐ ⭐ The hourly rate is $15.00/hour ⭐ ⭐ Quality work at an affordable price ⭐ Thank you for viewing my profile. As a seasoned WordPress developer and designer with over 5 years of experience, I am known for my meticulous attention to detail and exceptional organizational skills. I thrive on the challenges of delivering top-quality work within tight timelines and high expectations. With three years of experience as a WordPress virtual assistant, I excel in crafting stunning websites, uploading blogs and products, optimizing functionality, and providing top-notch support. 🔹 My areas of expertise:🔹 ✔ Responsive Web Design and Development -- I can implement new designs or port existing ones to Elementor, Oxygen, Bricks, or custom themes. I'll ensure that your website is fully optimized for responsiveness and page speed, ensuring that your users have a smooth and enjoyable browsing experience. ✔ API Integration -- Whether you need simple shortcodes or complicated data processing, bookings, calendars, custom widgets, or API integrations, I've got the skills and expertise to develop it for you. ✔ Custom Code Expertise -- I can provide comprehensive WordPress development services with my expertise in HTML, PHP, CSS, and MySQL. ✔ Membership Plugins Experience -- If you need a simple membership site with basic features or a complex system with multiple tiers and subscription levels, I have experience with BuddyBoss, Ultimate Membership Pro, and other plugins. ✔ WordPress Plugins Development Customisation -- Experience in dealing with and creating extensions of famous plugins like Woocommerce, advanced custom posts, code snippets, and document managers. ✔ WordPress LMS Systems -- I can create a learning management system website for you using Learnpress, Learndash and many more. ✔ 3 Years of SEO Experience -- With three years of SEO expertise under my belt, I specialize in driving organic traffic, boosting rankings, and optimizing content for maximum visibility. From keyword research to technical optimization, I'm dedicated to helping businesses dominate search engine results and achieve their digital goals. ✔ Email Marketing -- Crafting impactful email campaigns has been my forte for the past three years, where I've honed my skills in delivering messages that resonate with audiences and drive results. From crafting compelling subject lines to designing visually stunning layouts 🔹 WordPress Services🔹 ✔ Design and Develop a WordPress website from scratch ✔ Redesign existing WordPress websites ✔ Design a WordPress website based on Figma, XD or PSD design ✔ Design using Page Builders like Elementor Builder, Divi Builder, Visual Composer, Beaver Builder, WPBakery, Oxygen, Fusion Builder, etc. ✔ Woo-commerce for eCommerce website ✔ Payment Integration, Cart process, Custom product design functionality ✔ Have Excellent knowledge about product features and attribute ✔ WordPress Custom Post Types, Custom Taxonomy, Custom fields (ACF), Forms and Widgets ✔ Landing Page Design for Products, Apps, and Lead generation ✔ WordPress Plugin Development ✔ WordPress Membership sites I am committed to meeting your project deadline and delivering work in a standardized manner that ensures client SATISFACTION. Looking forward to working with you.
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