angularjs is a perfect client-side library for most web applications because it provides a very clean and structured approach. With a clean, structured front end, you will find that it is much easier to implement clean, well-structured server-side logic.
The angularjs framework forces correct implementation of MVC and also makes it easy to implement MVC correctly:
The declarative style of angularjs HTML templates makes the intent of the HTML more intuitive and makes the HTML easier to maintain.
angularjs provides a very simple and flexible filter interface that enables you to easily format data as it passes from the model to the view.
angularjs requires a lot less Document Object Model (DOM) manipulation than traditional methods do and guides you to put the manipulations in the correct locations in applications. It is easier to design applications based on presenting data than on DOM manipulation.
angularjs provides several built-in services and enables you to implement your own in a structured and reusable way. This makes your code more maintainable and easier to test.
Due to the clean separation of responsibilities in the angularjs framework, it is easy to test your applications and even develop them using a test-driven approach.