AngularJS (also known as Angular 1) is a discontinued free and open-source JavaScript-based web framework for developing single-page applications.

As of January 1, 2022, Google no longer updates AngularJS to fix security, browser compatibility, or jQuery issues.

Angular interpreted those attributes as directives to bind input or output parts of the page to a model that is represented by standard JavaScript variables.

[7] The framework adapted and extended traditional HTML to present dynamic content through two-way data-binding that allowed for the automatic synchronization of models and views.

As a result, AngularJS de-emphasized explicit Document Object Model (DOM) manipulation with the goal of improving testability and performance.

[8] Using dependency injection, Angular brought traditionally server-side services, such as view-dependent controllers, to client-side web applications.

AngularJS two-way data binding had its most notable feature, largely relieving the server backend of templating responsibilities.

The $scope service in Angular detected changes to the model section and modified HTML expressions in the view via a controller.

[14] AngularJS was originally developed in 2009 by Miško Hevery[15] at Brat Tech LLC[16] as the software behind an online JSON storage service, that would have been priced by the megabyte, for easy-to-make applications for the enterprise.

This venture was located at the web domain "GetAngular.com",[16] and had a few subscribers, before the two decided to abandon the business idea and release Angular as an open-source library.

Angular 4 was announced on 13 December 2016, skipping 3 to avoid a confusion due to the misalignment of the router package's version which was already distributed as v3.3.0.

The extension aimed to allow for easy detection of performance bottlenecks and offered a GUI for debugging applications.

Additionally, the extension was removed from the Chrome Web Store on June 1, 2022, due to its lack of updates and potential security concerns, such as requiring sensitive permissions.