If you're facing an issue, the HttpClient is the tool in Angular that allows you to communicate with a server via HTTP.

To ensure HttpClient is accessible throughout the application,

1. Begin by accessing the main AppModule,

2. Bring in the HttpClientModule from @angular/common/http,

   import { HttpClientModule } from '@angular/common/http';

3. Include it in the @NgModule.imports array.

   imports:[HttpClientModule, ]

Your module does not have any providers specified:

<strike>import { HttpModule } from '@angular/http';</strike>
import { HttpClientModule, HttpClient } from '@angular/common/http';

@NgModule({
  imports: [
    BrowserModule,
    HttpClientModule,
    BrowserAnimationsModule,
    FormsModule,
    AppRoutingModule
  ],
  providers: [ HttpClientModule, ... ]
  // ...
})
export class MyModule { /* ... */ }

Using HttpClient for Testing

When running ng test and encountering the "No provider for HttpClient" error, you should include the HttpClientTestingModule in the TestBed configuration:

// Http testing module and mocking controller
import { HttpClientTestingModule, HttpTestingController } from '@angular/common/http/testing';

// Other imports
import { TestBed } from '@angular/core/testing';
import { HttpClient, HttpErrorResponse } from '@angular/common/http';

describe('HttpClient testing', () => {
  let httpClient: HttpClient;
  let httpTestingController: HttpTestingController;

  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [ HttpClientTestingModule ]
    });

    // Inject the http service and test controller for each test
    httpClient = TestBed.get(HttpClient);
    httpTestingController = TestBed.get(HttpTestingController);
  });

  it('works', () => {
  });
});

You're encountering an error with HttpClient, indicating that you need to include HttpClientModule.

To fix this issue, make sure to import it in your app.module.ts file as shown below -

import { HttpClientModule } from '@angular/common/http';

Then, include it in the NgModule Decorator like this -

@NgModule({
...
imports:[ HttpClientModule ]
...
})

If this solution doesn't resolve the error, try clearing your browser's cookies and restarting the server. I faced the same error and this approach worked for me.

Angular has undergone recent changes, including the elimination of the app.module file. Now, in the updated structure, you need to make changes in the app.config file and include

provideHttpClient()

import { ApplicationConfig } from '@angular/core';
import { provideHttpClient } from '@angular/common/http'
import { provideRouter, withHashLocation } from '@angular/router';

import { routes } from './app.routes';

export const appConfig: ApplicationConfig = {
  providers: [
    provideRouter(routes, withHashLocation()),
    provideHttpClient()
  ]
};

If you wish to add an auth interceptor, you can do so like this

import { ApplicationConfig } from '@angular/core';
import { provideHttpClient, withInterceptors } from '@angular/common/http'
import { provideRouter, withHashLocation } from '@angular/router';

import { routes } from './app.routes';

export const appConfig: ApplicationConfig = {
  providers: [
    provideRouter(routes, withHashLocation()),
    provideHttpClient(withInterceptors([authenticationInterceptor]))
  ]
};

You can declare the interceptor as follows

import { HttpHandlerFn, HttpInterceptorFn, HttpRequest } from "@angular/common/http";

export const authenticationInterceptor: HttpInterceptorFn = (req: HttpRequest<unknown>, next:
    HttpHandlerFn) => {
    const modifiedReq = req.clone({
        headers: req.headers.set('Authorization', `Bearer ${sessionStorage.getItem('token')}`),
    });

    return next(modifiedReq);
};

To include the HttpClientModule in your Angular project, simply add it to the 'imports' array within the app.module.ts file.

import {HttpClientModule} from '@angular/common/http'; // include this line
@NgModule({
  declarations: [
    AppComponent,
    HeaderComponent
  ],
  imports: [
    BrowserModule,
    HttpClientModule, // include this line
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Once added, you can utilize the HttpClient in your project by using constructor injection.

import {HttpClient} from '@angular/common/http';

export class Services{
  constructor(private http: HttpClient) {}

I encountered the same problem. After doing some research and dealing with the issue, I finally found a solution that worked for me.

import { HttpModule } from '@angular/http';
import { HttpClientModule } from '@angular/common/http';

imports: [
  HttpModule,
  HttpClientModule
]

Make sure to import HttpModule and HttpClientModule in your app.module.ts file and add them to the imports array as shown above.

First Step: Begin by importing the HttpClientModule into your app.module.ts:

import { HttpClientModule} from '@angular/common/http';

Second Step: Within the module imports section, make sure to include HttpClientModule:

@NgModule({
  declarations: [
    ...
  ],
  imports: [
    HttpClientModule
  ],
  providers: [
    ....
  ],
  bootstrap: [AppComponent]
})

I encountered a similar issue and found a solution by making the following changes:

In the app.modules.ts file

import {HttpClientModule} from '@angular/common/http' 

and in the corresponding service class

import { HttpClient } from '@angular/common/http'

The constructor should be structured like this:

constructor(private http: HttpClient, private xyz: xyzService) {}

In the test file

import { HttpClientTestingModule } from '@angular/common/http/testing'

  beforeEach(() => TestBed.configureTestingModule({
    imports: [HttpClientTestingModule]
  }));

Open the file app.module.ts

Include the following import statement:

import { HttpClientModule } from '@angular/common/http';

After that, add HttpClientModule within the imports array

Your imports section should now look like this:

imports: [BrowserModule, IonicModule.forRoot(), AppRoutingModule, HttpClientModule]

The error is likely occurring because the necessary services, such as HttpClientModule, have not been registered in the root module, specifically the NgModule.

If you are encountering errors related to HttpClient, it could be due to the absence of HttpClientModule.

To resolve this issue, make sure to import HttpClientModule in the app.module.ts file:

import { HttpClientModule } from '@angular/common/http';

Next, include it in the NgModule Decorator like so:

@NgModule({
...
imports:[ HttpClientModule ]
...
})

By following these steps, the problem should hopefully be resolved. For further clarification, refer to the image linked below.

https://i.sstatic.net/bsN3Z.png

My problem was quite similar - I had both of my projects running at the same time and ended up editing the wrong app.modules.ts files.

Make sure to verify that first.

Once you've done that, insert the following code into your app.module.ts file:

import { HttpClientModule } from '@angular/common/http';

Next, add the code snippet below to the imports array in your app.module.ts file:

  imports: [
    HttpClientModule,....
  ],

With these changes, everything should be working fine now!

Dealing with a similar issue, I found a solution in my app.module.ts by making the following updates:

import { HttpModule } from '@angular/http';
import { HttpClientModule } from '@angular/common/http';

Within the same (app.module.ts) file, I added the following to the @NgModule imports[] array:

HttpModule,
HttpClientModule

Encountered an issue when injecting a Service that utilizes HTTPClient into a class. This class was then used in the service, resulting in a circular dependency. Despite being able to compile the app with warnings, an error occurred in the browser console.

The error message displayed was:

"No provider for HttpClient! (MyService -> HttpClient)"

leading to a broken app.

The following code snippet demonstrates a working solution:

import { HttpClient, HttpClientModule, HttpHeaders } from '@angular/common/http';
import { MyClass } from "../classes/my.class";

@Injectable()
export class MyService {
  constructor(
    private http: HttpClient
  ){
    // perform actions with myClass instances
  }      
}
.
.
.
export class MenuItem {
  constructor(

  ){}
}

The issue arises in the following code snippet:

import { HttpClient, HttpClientModule, HttpHeaders } from '@angular/common/http';
import { MyClass } from "../classes/my.class";

@Injectable()
export class MyService {
  constructor(
    private http: HttpClient
  ){
    // perform actions with myClass instances
  }      
}
.
.
.
import { MyService } from '../services/my.service';
export class MyClass {
  constructor(
    let injector = ReflectiveInjector.resolveAndCreate([MyService]);
    this.myService = injector.get(MyService);
  ){}
}

Upon injecting MyService into MyClass, a circular dependency warning was raised. Despite being able to compile with the warning, the app ceased to function properly and an error was logged in the browser console. In this scenario, the issue was not related to @NgModule but rather to circular dependencies. It is advisable to address any case-sensitive naming warnings if the problem persists.

Solution: Resolved the issue by including the HttpClientModule provider within the imports section

import { HttpClientModule } from '@angular/common/http';

@NgModule({
  declarations: [
    AppComponent,
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    HttpClientModule,
  ]
})

To fix this problem, make sure to add the above code snippet in the

src -> app -> app.module.ts

Encountered a similar issue recently. To resolve it, make sure to include the HttpClientModule in your app.module.ts file like this:

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

import { AppComponent } from './app.component';
import { HttpClientModule } from '@angular/common/http';

@NgModule({
  declarations: [
    AppComponent
],

imports: [
    BrowserModule,
    HttpClientModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

When working in the app.module.ts file, you must remember to include HttpClientModule in the import section. Here is an example:

import { HttpClientModule } from '@angular/common/http';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    BrowserAnimationsModule,
    HttpClientModule,  // Don't forget to add this line
    FormsModule,
    ...

If you encounter the NullInjectorError in Angular 17 with the message "No provider for _HttpClient!", follow these steps:

1. Open your app.config.ts file.

2. Inside the providers array, add the following line:

provideHttpClient()

import { ApplicationConfig } from '@angular/core';
import { provideRouter } from '@angular/router';
import { routes } from './app.routes';
import { provideClientHydration } from '@angular/platform-browser';
import { provideAnimationsAsync } from '@angular/platform-browser/animations/async';
import { provideHttpClient } from '@angular/common/http';

export const appConfig: ApplicationConfig = {
  providers: [
    provideRouter(routes),
    provideClientHydration(),
    provideAnimationsAsync(),
    provideHttpClient(),
  ],
};

By adding provideHttpClient() to the providers array, you should be able to fix the NullInjectorError." - Testimonial from a satisfied user

The problem was resolved by including both HttpModule and HttpClientModule in the imports and providers sections of the app.module.ts file. To resolve the issue, the following changes were made: imports ->

import {HttpModule} from "@angular/http";
{HttpClientModule} from "@angular/common/http";

Dealing with a similar issue, I found that the solution was to ensure that HttpModule was imported before HttpClient Module:

import { HttpModule } from '@angular/http';
import { HttpClientModule } from '@angular/common/http';
.
.
.
imports: [
  BrowserModule,
  HttpModule,
  HttpClientModule
],

To utilize the functionality, simply include both the HttpModule and the HttpClientModule:

import { HttpModule } from '@angular/http';
import { HttpClientModule } from '@angular/common/http';

There is no requirement for using the HttpClient.

A resolution to this issue was discovered and discussed on the Angular GitHub page. https://github.com/angular/angular/issues/20355

After encountering the same issue for quite some time, I experimented with numerous solutions and suggestions from different sources, including stackOverflow. However, what ultimately solved the problem for me was realizing that there was a crucial element missing in ensuring the functionality of my project, particularly with the latest version of Angular.

Initially, I had to include the HttpClientModule in the main app file app.module.ts within the import[] array. Subsequently, I added the necessary services in the same file within the providers[] array, or alternatively, injected the service into the root application from the service file by employing the following code snippet:

@Injectable({
  providedIn: 'root'
})

However, the key component that made all the difference for me was incorporating

importProvidersFrom(HttpClientModule)

import { ApplicationConfig } from '@angular/core';
import { HttpClientModule } from '@angular/common/http';
import { importProvidersFrom } from '@angular/core';

export const appConfig: ApplicationConfig = {
  providers: [
    importProvidersFrom(HttpClientModule),
  ]
};

In my situation, I encountered an issue where I was utilizing a service within a sub module rather than the root AppModule. The HttpClientModule was only imported in that specific module.

Therefore, I had to adjust the default scope of the service by changing the 'providedIn' property to 'any' in the @Injectable decorator.

Typically, when generating the service using angular-cli, the 'providedIn' property is initially set to 'root'.

I hope this information proves to be helpful.

After struggling with the issue, I discovered that rebuilding the app resolved the problem for me.

Although I had already imported the HttpClientModule as recommended in previous discussions, I was still encountering the error. However, once I stopped the server and rebuilt the app using the ng serve command, the error disappeared.

One specific problem I encountered was related to how I included the HttpClientModule in my App Module. I realized that the HttpClient I was injecting had been imported from the incorrect package, specifically from the signalr package.

import { HttpClient } from '@aspnet/signalr';

This confusion arose because I failed to pay attention during the autocomplete process.

https://i.sstatic.net/zKQdF.png

I suspect that others may have also encountered a similar issue, assuming it was caused by not importing the HttpClientModule in their App Module.

I encountered an issue when utilizing a service from an angular module found in an npm package. This service required the injection of HttpClient. Upon installing the npm package, a duplicate node_modules directory was inadvertently created within the package directory due to how npm handles version conflicts (the module in question is engi-sdk-client):

https://i.sstatic.net/DSZ82.png

Evidently, the dependency to HttpClient was not resolved correctly, as the locations of HttpClientModule injected into the service (residing in the duplicate node_modules directory) and the one injected in app.module (the correct node_modules) did not align.

I've encountered this issue in other setups where a duplicate node_modules directory was present due to an incorrect npm install command.

This flawed configuration also results in the error message No provider for HttpClient! being thrown at runtime.

TL;DR; Make sure to check for duplicate node_modules directories if none of the other solutions seem to resolve the issue!

Resolved

import { HttpClientModule } from '@angular/common/http';
@NgModule({
  declarations: [...],
  imports: [
    ...
    HttpClientModule,
  ],
  providers: [...],
  bootstrap: [...],
})
export class AppModule {}

Adding HttpClientModule to the main module of my application fixed the issue.

This indicates that your Angular application is requesting the Http provider dependency, but it is not specified in your application configuration file.

To resolve this issue, you will need to include provideHttpClient in your configuration array

export const appConfig: ApplicationConfig = {

providers: [provideHttpClient()] };

https://i.sstatic.net/LOpep4dr.jpg

For Angular version 18 and above, there has been a change in how HTTP capabilities are provided. The existing provider function provideHttpClient() should now be used instead of HttpClientModule, which has been deprecated. Make sure to use this function to enable HTTP functionality in your application module.

@NgModule({
  imports: [
    BrowserModule,
    // Remove any unnecessary modules
  ],
  declarations: [
    AppComponent,
    ...
 ],
 providers: [provideHttpClient()] // Include the provider function here
 bootstrap: [ AppComponent ]
})
export class AppModule {}