What is the advantage & disadvantage of Angular js?

AngularJS, often referred to as Angular 1, is a JavaScript-based open-source front-end web application framework maintained by Google. It was widely used in the past, but it has been largely replaced by newer versions of Angular (such as Angular 2 and later) for modern web development. Here are some advantages and disadvantages of AngularJS:


  1. Two-way data binding: One of the key features of AngularJS is two-way data binding, which means that changes in the user interface automatically update the underlying data model and vice versa. This simplifies the code and reduces the need for boilerplate code to update the DOM manually.
  2. Modular architecture: AngularJS promotes a modular and reusable code structure. It uses modules and dependency injection to organize code into manageable components, making it easier to maintain and scale.
  3. Declarative UI: AngularJS uses a declarative approach to building the user interface, allowing developers to describe the desired result and let AngularJS handle the underlying logic. This can lead to cleaner and more expressive code.
  4. Extensive ecosystem: AngularJS has a large ecosystem of third-party libraries, modules, and tools that can be used to enhance development and productivity.
  5. Testing support: AngularJS provides built-in support for unit testing, making it easier for developers to write and run tests for their code.


  1. Performance: One of the main criticisms of AngularJS is its performance, especially on large and complex applications. The two-way data binding can introduce performance bottlenecks, and AngularJS may not be as fast as some other modern front-end frameworks.
  2. Steep learning curve: AngularJS has a steeper learning curve compared to some other front-end frameworks. The complexity of its features and the use of concepts like dependency injection may be challenging for beginners.
  3. Outdated technology: AngularJS is an older technology, and it has been largely replaced by newer versions of Angular. As a result, it may not be the best choice for new projects, as support and updates are not as active.
  4. Lack of official mobile support: AngularJS was not initially designed with mobile development in mind. While there are third-party solutions for mobile development, newer versions of Angular provide better native support for building mobile applications.
  5. Verbose code: AngularJS code can be more verbose compared to some other modern front-end frameworks. This can make the code harder to read and maintain, especially for large projects.

It's important to note that many of the disadvantages mentioned apply specifically to AngularJS, the first version of Angular. Subsequent versions of Angular (starting from Angular 2) have addressed some of these issues and introduced significant improvements in terms of performance, modularity, and developer experience.

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