Excerpt: When it comes to scripting, there is JavaScript, which provides frameworks such as Angular JS. Everyone has heard about Angular JS; it’s natural to fill your controllers and scope of research with unnecessary logic after you first begin using Angular.


It’s critical to understand that your controller should be really thin ahead of schedule. It’s hard to put enduring analysis and business logic in and out of your AngularJS controllers, but that isn’t how controllers work. The majority of our application’s business rules and continual data should be handled or sequestered in a service.

There are many misconceptions about how to obtain persistent data from someone’s controller, and you should be aware of the fact that it is simply not the function of a controller. Because controllers are just initialized when required and ultimately cleaned up when it is no longer required, the data is stored in service, and to develop your own service, AngularJS provides three methods: factory, service, and providers.

What is exactly Angular JS?

AngularJS is very much an open-source web application framework. Misko Hevery and Adam Abrons founded it in 2009. It is a continuously increasing and expanding framework to provide better solutions. It transforms static HTML into dynamic HTML. Its features, such as dynamic binding and dependency injection, completely eradicate the necessary code that we would have to write. It allows you to use HTML as your template language and extend HTML syntax to communicate your application components clearly and concisely. It is a free and open-source project that everyone can use and modify. 

It uses Directives to extend HTML attributes and HTML to bind data. If we talk about some features of Angular JS-

  • AngularJS is an enormously potent framework for creating Rich Internet Applications (RIA).
  • AngularJS allows developers to write client-side JavaScript applications in a smooth Model View Controller (MVC) style.
  • AngularJS applications are cross-browser compatible. It handles JavaScript code automatically, which is browser-specific.
  • AngularJS is open source and completely free, which is used by professional developers worldwide – released under Apache License 2.0.

However, to know more information on this exciting platform and enhance your career growth in this Frontend and Web Development,  Angular Training is very beneficial.

The following picture will depict some of the core features of Angular JS:

Angular gives us three options for creating and registering our own service.

  • Factory
  • Service
  • Provider

Let’s discuss each one of us: 

What exactly do factories, services, and providers do in AngularJS? 

The truth is that they are doing the same thing in radically different ways. All three methods make persistent data or bits and pieces of business logic available throughout your app. They are all suppliers, and the factory and the service are simply extensions of the provider. They can all be injected into different parts of your app via dependency injection. So, what distinguishes them?

1. Factory:  

A factory is a simple function that lets you add logic before creating an object. It returns the object that was created. The most popular approach to registering a service is through a factory. Factories are created using the .factory method, which accepts two parameters: a string containing the name of your factory and a factory function that declares and returns an object. Whenever the factory’s identity is allowed to pass into a controller as a dependency, the properties connected to this object will just be made accessible to other parts of your app.

Since the factory method weaves your service in the instance object it produces, neither of your app’s internal business logic is ever exposed.

When to Apply

It is simply a collection of functions, similar to a class. As a result, when used with the function Object() { [native code] } function, it could be instantiated in different controllers.

Features of Factory:

  • The factory design pattern is followed. The factory is a central location where new objects or functions are created.
  • Not only does it create singletons, but it also creates customizable services.
  • The .service() method is a factory that always returns the same type of service, a singleton, and has no easy way to customize its behavior. That .service() method is typically used as a shortcut for something requiring no configuration.

2. Service:

A service is a function Object() { [native code] } function that uses the new keyword to create an object. You could even add properties and functions to a service object using this keyword. It does not return anything, unlike the factory. Services, like factories, are created using the .service method. They also accept two parameters: a string representing your new service’s name and a function Object() { [native code] } function. Rather than proclaiming an object, they are using the keyword this, have always been instantiated well with the new keyword, and do not actually return anything; services follow separate rules than factories because they accept function Object() { [native code] } functions.

Every one of the underlying logic of a specific service is exposed to the remaining portion of the app even though services use function Object() { [native code] } functions, and all of the methods and properties involved should be connected to this.

When to Apply

It is a one-of-a-kind object. Whenever you need to share a common object across multiple applications, use this method. For instance, authenticated user information.

Features of Service:

  • Clumsily Instantiated: It will never be instantiated if it is not injected. To use it, you must inject it into a module.
  • Singleton: When injected into multiple modules, each would have access to just one instance. As a result, sharing data between controllers is extremely convenient.

3. Provider:

A provider is being used to generate a service object that can be customized. It uses the $get() function to return a value. Whenever you need to configure your service object module-by-module prior to actually making it available. Providers perform similar functions but are created using the Provider method. They, like services, accept a string containing the name of your new provider and a function that returns nothing. The object returned by the function designated to this is the only part of your provider that will be made available to your controller. The most important aspect of providers is $get.

Using $get, you can hide or reveal your provider’s internal logic however you seem best suited. It’s also worth noting that providers are the only services that can be passed into your app’s app. config, allowing you to change parts of your service before they’re made better accessible for the rest of your app.

When to Apply

When you need to configure your service object module-by-module prior to actually making it available.

Features of Provider:

  • The provider is the most adaptable way to create services in Angular.
  • Can indeed we create a factory that is dynamically configurable, but we can also custom configure the factory once during the bootstrapping of our entire application using the provider method.
  • In actuality, the provider method is what is implemented when we configure our services with the .service or .factory methods, according to the angular documentation.
  • This $get property, which is a function, is what distinguishes the provider as a provider AngularJS wants the provider to get a $get property that contains the value of a function that Angular Components would recognize as a factory function. But what distinguishes this entire-provider setup?

When should you use one over the other?

The solution is to use the most specialized version that achieves your goal. Assume you’re returning an existing object defined elsewhere that accepts function Object() { [native code] } arguments. Because you can’t pass arguments to the service, you’d use a factory instead.

One of the most important considerations when deciding between a provider and a factory is whether you’ll be able to configure the created object before it has been generated. This is accomplished by invoking module.config() and obtaining an instance of the provider itself (instead of the object returned by the provider). This is accomplished by appending “Provider” to the end of the name of your provider when injecting it.

Benefits of Angular JS:

  • It makes it possible to create Single Page Applications that are both clean and manageable.
  • It adds data binding capabilities to HTML. Like an outcome, it provides a rich and attentive experience to users.
  • AngularJS code can be unit tested.
  • AngularJS makes use of dependency injection and problem separation.
  • AngularJS provide reusable components.
  • With AngularJS, developers can accomplish more features and functions with less code.
  • AngularJS views have been true HTML pages, while JavaScript controllers carry out business processing.


It is a quick and relatively superficial overview of the similarities and differences discovered in the three ways that AngularJS allows you to register services accessible throughout your app. To summarise, providers include providers, factories, and services. A factory is a particular case of a provider in which all you need is a $get() function. It enables you to write it using less code. A service is a subclass of a factory that allows you to return an instance of a new object while writing less code. Hope you understand distinguishing between Factory, Service, and Provider in Angular and like using the AngularJS factory, service, and provider functions whilst still developing your AngularJS app.

Author Bio

Meravath Raju is a Digital Marketer, and a passionate writer, who is working with MindMajix, a top global online training provider. He also holds in-depth knowledge of IT and demanding technologies such as Business Intelligence, Salesforce, Cybersecurity, Software Testing, QA, Data analytics, Project Management and ERP tools, etc.


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