Dealing With ‘error: [$injector:unpr] Unknown Provider’ In Angularjs

Dealing with ‘error: [$injector:unpr] Unknown Provider’ in AngularJS


When working with AngularJS, you may encounter an error message that reads “error: [$injector:unpr] Unknown Provider.” This error occurs when AngularJS is unable to find a provider for a service that is referenced in your code. The provider is responsible for instantiating and configuring the service, and without it, AngularJS cannot create instances of the service.


Causes of this error:


  • Typo in the service name
  • Missing or incorrect dependency injection annotations
  • Service is not registered in the module
  • Circular dependency

Potential Solutions:

  1. Check for Typos: Ensure that the service name referenced in your code is spelled correctly. Pay attention to capitalization and special characters.

  2. Verify Dependency Injection Annotations: AngularJS services must be defined with dependency injection (DI) annotations that specify which services they rely on. Check if the necessary DI annotations are present and correct.

  3. Register the Service in the Module: The service must be registered in the AngularJS module that is using it. This is typically done in the app.js or main.js file. Use the angular.module('moduleName').provider('serviceName', function() {}); syntax to register the service.

  4. Resolve Circular Dependencies: Circular dependencies occur when two or more services depend on each other. AngularJS cannot resolve circular dependencies out of the box. To resolve this, consider using a service locator like $injector.get('serviceName') instead of direct dependency injection.

  5. Restart the Application: Sometimes, restarting the application can clear any temporary errors that may have caused the “Unknown Provider” error.

Additional Tips:

  • Use a dependency injection checker to ensure that all services are properly annotated and registered.
  • Remove unused services or dependencies to eliminate potential conflicts.
  • Review the AngularJS documentation for more information on service providers and dependency injection.
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Comments 13
  1. This is a very helpful article. I’ve been struggling with this error for a while now, and this article helped me to finally fix it. Thanks!

  2. This article is not helpful at all. It just repeats the same thing over and over again. I still don’t know how to fix this error.

  3. I found this article to be very informative. It provides a detailed explanation of the error and how to fix it. I would recommend this article to anyone who is experiencing this error.

  4. I disagree with the author’s assessment of the severity of this error. I believe that this error is a serious problem that can cause major headaches for developers. I would not recommend this article to anyone.

  5. Wow, this article is really great. It’s so easy to understand, even for someone like me who doesn’t know anything about AngularJS.

  6. This article is like a rollercoaster ride. It takes me on a wild journey of emotions, from anger to frustration to laughter.

  7. I’m not sure if this article is supposed to be funny, but I find it hilarious. The author’s dry wit is just my style.

  8. Oh my goodness, this article is amazing! I’ve been struggling with this error for weeks, and this article has finally helped me to fix it. Thank you, thank you, thank you!

  9. This article is the worst. It’s full of errors and doesn’t provide any real solutions to the problem. I would not recommend this article to anyone.

  10. I don’t understand what this article is talking about. It’s like it’s written in a foreign language. I wish the author would use simpler terms.

  11. I’m not so sure I believe this article. It sounds too good to be true. I’m going to have to do some more research before I try any of these solutions.

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