What is NgModules in Angular
Tags: angular
Published: 2023-06-19 06:49:55

In Angular, NgModules are an essential concept that allows developers to organize, configure, and manage the various components, services, directives, and other artifacts that constitute an Angular application. NgModules are created as classes decorated with the @NgModule decorator, and they serve as containers for related functionality within the application.

NgModules facilitate modularity and organization by dividing the application into cohesive units. They enable developers to group related components, directives, and services together, making it easier to manage and maintain different parts of the application. By encapsulating these elements within an NgModule, they become self-contained and reusable, promoting code reusability and maintainability.

One of the primary purposes of NgModules is to declare and export the components, directives, and pipes used within the module. The declarations array within an NgModule allows developers to specify the components, directives, and pipes that belong to that module, making them available for use within the module itself. Additionally, these elements can be exported from the NgModule to be utilized by other modules, promoting reusability across the application.

NgModules also play a crucial role in providing services within the application. The providers array within an NgModule allows developers to register service providers at the module level. This ensures that the services are accessible and shared within the module and its components, promoting a consistent and efficient approach to managing dependencies and data sharing.

Furthermore, NgModules offer metadata and configuration options to fine-tune various aspects of the Angular application. This includes configuration for routing, dependency injection, and other Angular features. By using the imports array, modules can import other modules, enabling the reuse of components, directives, and services defined in those modules.

NgModules also support lazy loading, a powerful technique in Angular for optimizing application performance. By configuring routing and utilizing the loadChildren property, NgModules can be loaded lazily on-demand when specific routes are accessed. This helps reduce the initial load time of the application and improves user experience. By obtaining [Angular Course](https://www.edureka.co/angular-training), you can advance your career in Angular. With this course, you can demonstrate your expertise in applications using React concepts such as Angular Modules, Components, Databinding, Angular Forms, Angular Directives and Pipes, Services and Dependency Injection (DI), many more fundamental concepts, and many more critical concepts among others. 

While the root NgModule, known as the AppModule, serves as the entry point for the application and typically contains the root component, Angular allows the creation of feature-specific NgModules. Feature NgModules help organize and encapsulate functionality specific to a particular feature or module of the application, promoting separation of concerns and code modularity.

**Here's a more detailed explanation of NgModules in Angular:**

**Modularity and Organization:** NgModules promote modularity and organization within an Angular application. They help divide the application into cohesive and reusable units, allowing developers to manage and maintain different parts of the application more efficiently.

**Declaration and Export:** NgModules declare and export the various elements of an Angular application, such as components, directives, and pipes. By declaring these elements within an NgModule, they become accessible and usable within the module and potentially exportable to other modules for reuse.

**Component Registration:** NgModules play a crucial role in registering and configuring components within an Angular application. Components are typically declared within an NgModule's declarations array, making them available for use within the module and any child modules.

**Service Providers:** NgModules also define the providers of services that the application requires. Service providers can be registered at the module level, ensuring that they are accessible and shared across the module and its components. Providers can be added to the providers array of an NgModule.

**Metadata and Configuration:** NgModules use metadata to provide additional configuration for various aspects of an Angular application. This includes configuration for routing, dependency injection, and other Angular features. The imports array allows modules to import other modules, enabling the reuse of components, directives, and services defined in other modules.

**Lazy Loading:** NgModules are essential for lazy loading in Angular. Lazy loading allows modules to be loaded on-demand, reducing the initial load time of the application. By configuring routing and using the loadChildren property, modules can be loaded lazily when specific routes are accessed.

**Root NgModule:** Angular applications typically have a root NgModule called the AppModule, which serves as the entry point for the application. It imports and configures other modules and declares the root component that gets bootstrapped when the application starts.

**Feature NgModules:** In addition to the root NgModule, Angular allows the creation of feature-specific NgModules. Feature NgModules help organize and encapsulate functionality specific to a particular feature or module of the application.

In summary, NgModules in Angular provide a mechanism for organizing, configuring, and managing components, services, directives, and other artifacts within an application. They foster modularity, reusability, and configuration flexibility, allowing developers to structure and maintain Angular applications efficiently. NgModules are instrumental in promoting code organization, facilitating code sharing, enabling lazy loading, and enhancing the overall maintainability and scalability of Angular projects.