juniorAngularJS

What is AngularJS and how is it different from modern Angular?

Updated Apr 28, 2026

Short answer

AngularJS is a JavaScript framework based on MVC and two-way data binding, while modern Angular is component-based and uses TypeScript.

Deep explanation

AngularJS (1.x) uses scope-based architecture, two-way binding, and digest cycle for updates. Modern Angular (2+) uses components, unidirectional data flow, RxJS, and improved performance. AngularJS relies heavily on watchers, while Angular uses change detection strategies.

Real-world example

Legacy enterprise apps still running AngularJS, while new apps use Angular.

Common mistakes

  • Confusing AngularJS with Angular 2+
  • assuming they are same.

Follow-up questions

  • Why AngularJS deprecated?
  • Main architectural difference?

More AngularJS interview questions

View all →