midAngularJS
What is AngularJS dependency injection system?
Updated Apr 28, 2026
Short answer
DI automatically provides dependencies to components.
Deep explanation
AngularJS DI injects services into controllers, directives, etc., improving modularity and testability.
Real-world example
Injecting API service into controller.
Common mistakes
- Minification issues without annotation.
Follow-up questions
- What is $inject?
- Why DI?