---
title: "Explain AngularJS Architecture and Components"  
description: "Angularjs is a JavaScript-based open-source front-end web framework used for building dynamic single-page applications (SPAs)."  
author: "Ashutosh Patel"  
published: 2025-04-22  
updated: 2025-04-22  
canonical: https://www.mindstick.com/articles/339103/explain-angularjs-architecture-and-components  
category: "angular js"  
tags: ["angular js", "angularjs directive", "angularjs controller", "Angular"]  
reading_time: 3 minutes  

---

# Explain AngularJS Architecture and Components

Angularjs is a JavaScript-based open-source front-end web framework used to build dynamic [single-page applications](https://www.mindstick.com/articles/336207/single-page-application-in-angularjs) (SPA). It follows the model-view-controller (MVC) architecture, although it is more accurately described as **MVVM** (`Model-View-ViewModel`) or MVW (Model-View-Whatever) due to its flexibility.

#### Key Components of AngularJS Architecture

There are some components of angularjs architecture are as follow,

## Model:

- The model is the data source of the application.
- It represents the data and logic of the application.
- Angularjs supports two-way data binding, so when the model changes, the view reflects the change and vice versa.

## View:

- The view is the HTML markup where AngularJS expressions and directives are used.
- It displays data from the model to the user and reacts to [user interactions](https://www.mindstick.com/forum/158690/how-can-you-handle-user-interactions-such-as-button-clicks-using-jquery).
- AngularJS extends HTML with custom directives, such as `ng-model`, `ng-bind`, `ng-repeat`, etc.

## Controller

- The [controller](https://www.mindstick.com/forum/160770/what-are-controllers-in-angular) is a [JavaScript function](https://www.mindstick.com/forum/144/how-to-call-javascript-function-in-c-sharp) that manages scope and [business logic](https://answers.mindstick.com/qa/30543/what-is-business-logic).
- It initializes the model and handles user input.
- It is connected to the view through the `$scope` object.

## Scope

- An object that connects the controller and the view.
- Acts as a glue between the model and the view.
- Any change in the scope is automatically reflected in the view (due to two-way data binding).

## Directives

- Special tokens ([HTML attributes](https://www.mindstick.com/forum/160677/explain-about-html-attributes)) in markup that tell Angularjs to do something with a DOM element.
- Examples: `ng-model`, `ng-bind`, `ng-if`, `ng-repeat`.
- You can also create [custom directives](https://www.mindstick.com/articles/336208/how-to-create-custom-directives-in-angularjs) for reusability.

## Expressions

- [Expressions](https://www.mindstick.com/blog/304413/angularjs-expressions-and-modules) are used to bind data to HTML.
- Written inside `{{ }}` and behave like JavaScript expressions.
- Automatically updated when the scope data changes.

## Filter

- Used to format data before showing it to the user.
- Example: `currency`, `date`, `filter`, `lowercase`, `uppercase`.

## Services

- Reusable business logic or functions that can be injected into controllers, directives, filters, etc.
- Example: `$http`, `$location`, `$timeout`.

**[Dependency Injection](https://www.mindstick.com/interview/1109/what-are-the-different-types-of-dependency-injection-explain-with-examples) (DI)**

- A [design pattern](https://www.mindstick.com/forum/34032/factory-method-design-pattern-using-c-sharp) used to inject dependencies such as services into controllers or other components.
- Promotes modularity and testability.

## Routing (ngRoute / UI-Router)

- Used to create single-page applications with multiple views.
- Maps URLs to templates and controllers.
- Enables deep-linking and navigation without reloading the page.

#### AngularJS Flow Overview

- The **user interacts** with the view (HTML).
- The `view` is bound to a `scope` object.
- The `controller` updates the `model` through the `scope`.
- AngularJS detects `model`changes using the **digest cycle** and updates the `view` accordingly.
- Optional `services` and `filters` can be used for logic and presentation.

---

Original Source: https://www.mindstick.com/articles/339103/explain-angularjs-architecture-and-components

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