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Difference between Service, Factory and Provider in AngularJS
// Source: https://groups.google.com/forum/#!topic/angular/hVrkvaHGOfc
// jsFiddle: http://jsfiddle.net/pkozlowski_opensource/PxdSP/14/
// author: Pawel Kozlowski
var myApp = angular.module('myApp', []);
//service style, probably the simplest one
myApp.service('helloWorldFromService', function() {
this.sayHello = function() {
return "Hello, World!"
};
});
//factory style, more involved but more sophisticated
myApp.factory('helloWorldFromFactory', function() {
return {
sayHello: function() {
return "Hello, World!"
}
};
});
//provider style, full blown, configurable version
myApp.provider('helloWorld', function() {
// In the provider function, you cannot inject any
// service or factory. This can only be done at the
// "$get" method.
this.name = 'Default';
this.$get = function() {
var name = this.name;
return {
sayHello: function() {
return "Hello, " + name + "!"
}
}
};
this.setName = function(name) {
this.name = name;
};
});
//hey, we can configure a provider!
myApp.config(function(helloWorldProvider){
helloWorldProvider.setName('World');
});
function MyCtrl($scope, helloWorld, helloWorldFromFactory, helloWorldFromService) {
$scope.hellos = [
helloWorld.sayHello(),
helloWorldFromFactory.sayHello(),
helloWorldFromService.sayHello()];
}
@LeftOverCoder
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LeftOverCoder commented Mar 18, 2014

Service is singleton and simple version of Factory. While Factory is a simple version of Provider, Factory is a more flexable compared to service method, and a short handed for configuring a service when $get method is required. Provider creates new object by the $get factory function. Provider is not injectable during run phase or run time while all others are ( Constant, Variable, Service, and Factory), however, Provider is injectable during the configuration phase or compile time.

Provider should be used very sparely as you want to use compile time injection. Usually, Service does most of the job while Factory can deal with more sophisticated logic. Remember, Service is a singleton so if you need to create new object every time, use Factory instead.

@dmitriz
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dmitriz commented Apr 22, 2014

Here is a very simple example of provider without 'this':
http://jsbin.com/xolom/2/edit

@sunew
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sunew commented May 26, 2014

@gigablox : Thanks for the super example, that really got it working for me. A question/comment: Instead of using events to signal data is ready, wouldn't it be a good just to return a promise. And then let the controller set then on the promise, and set data on the scope from then?

@hanmina
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hanmina commented Jun 17, 2014

thanks for useful code block. but I would be happy if you explain each type, purpose and when to use which one.

@joshids
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joshids commented Jun 24, 2014

  1. When you register the Service you return an object, when Angular needs to inject "service" into any component, it will inject this object.
  2. When you register the Factory, you return a constructor function. When angular needs to inject "service" into any component, it will first do a

new factoryReturnedFunction();

and then inject it. This will be done only for the first time service is requested. For all subsequent injections, object created first time will be used.
3. When you register a Provider, it has same behavior as Factory above. The function assigned to ...$get..., will be used as constructor function.

@expalmer
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expalmer commented Jul 9, 2014

thanks for sharing, you help me alot to understand.

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ghost commented Jul 21, 2014

Nice Info

@Webenius
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Webenius commented Jul 28, 2014

@Mithrandir0x, thank you for the example!
If we need a service and we define it using the "factory" method, is it write or false?

https://github.com/SAM-BI/jira-rest-angular

@codeandcats
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codeandcats commented Jun 11, 2015

Thanks, this is very helpful. :)

@Hemalatah
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Hemalatah commented Aug 25, 2015

Thanks much for the explanation. would you tell me, where to use which, I mean, how to make a right choice among them?
Appreciate your time

@xis19
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xis19 commented Nov 18, 2015

Thanks for the helpful example.

@vahidalvandi
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vahidalvandi commented Mar 3, 2016

very thanks

@umangparekh001
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umangparekh001 commented Feb 1, 2017

Many Thanks !

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ghost commented Mar 29, 2017

Nice explanation about Service / Provider / Factory, Very useful, Thank you very much !

@shashankGopannagari
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shashankGopannagari commented Nov 16, 2017

Nice Explanation. Helpful

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