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Angular Book

Role of Modules

In Angular, an NgModule is a mechanism to organize code into cohesive blocks. It serves as a container for a set of components, directives, pipes, and services that are related. The module also defines the dependencies needed for these elements to work properly.

  • Entry point: An Angular application has at least one root module (usually AppModule) that is bootstrapped.
  • Compilation: The Angular compiler needs to know which components and directives are used in templates; modules provide this information via declarations.
  • Encapsulation: Modules limit the visibility of components, directives, and pipes. Those not exported remain private to the module.
  • Organization: They facilitate the separation of features (feature modules) and the sharing of reusable blocks (shared modules).
  • Configuration: Services can be provided at the module level, which determines their scope and lifecycle.

With the introduction of standalone components (Angular 14+), it is now possible to create applications without NgModules, but modules remain a powerful option for structuring large projects.

Note: Even though standalone components reduce the need for modules, understanding NgModules is essential for maintaining and evolving existing Angular applications.