Cannot find the '@angular/common/http' module

Question

I am following this fundamental tutorial on Angular about Http.

As one can see in the \"Setup: Installing the module\" section, they import the HttpClientModule as f

Answer 1

Important: HttpClientModule is for Angular 4.3.0 and above. Check @Maximus' comments and @Pengyy's answer for more info.

---

Original answer:

You need to inject HttpClient in your component/service not the module. If you import HttpClientModule in your @NgModule

// app.module.ts:
 
import {NgModule} from '@angular/core';
import {BrowserModule} from '@angular/platform-browser';
 
// Import HttpClientModule from @angular/common/http
import {HttpClientModule} from '@angular/common/http';
 
@NgModule({
  imports: [
    BrowserModule,
    // Include it under 'imports' in your application module
    // after BrowserModule.
    HttpClientModule,
  ],
})
export class MyAppModule {}

So change

constructor(private httpClient: HttpModule) {}

to

constructor(private httpClient: HttpClient) {}

as it's been written in the documentation

---

However, since you imported the HttpModule

you need to inject constructor(private httpClient: Http) as @Maximus stated in the comments and @Pengyy in this answer.

And for more info on differences between HttpModule and HttpClientModule, check this answer

Answer 2

You should import http from @angular/http in your service:

import {Http} from '@angular/http';

constructor(private http: http) {} // <--Then Inject it here


// now you can use it in any function eg:
getUsers() {
    return this.http.get('whateverURL');
}

Answer 3

note: This is for @angular/http, not the asked @angular/common/http!

Just import in this way, WORKS perfectly:

// Import HttpModule from @angular/http
import {HttpModule} from '@angular/http';


@NgModule({
  declarations: [
    MyApp,
    HelloIonicPage,
    ItemDetailsPage,
    ListPage
  ],
  imports: [
    BrowserModule,
    HttpModule,
    IonicModule.forRoot(MyApp),
  ],
  bootstrap: [...],
  entryComponents: [...],
  providers: [... ]
})

and then you contruct in the service.ts like this:

constructor(private http: Http) { }

getmyClass(): Promise<myClass[]> {
  return this.http.get(URL)
             .toPromise()
             .then(response => response.json().data as myClass[])
             .catch(this.handleError);
}

Answer 4

For anyone using Ionic 3 and Angular 5, I had the same error pop up and I didn't find any solutions here. But I did find some steps that worked for me.

Steps to reproduce:

• npm install -g cordova ionic
• ionic start myApp tabs
• cd myApp
• cd node_modules/angular/common (no http module exists).

ionic:(run ionic info from a terminal/cmd prompt), check versions and make sure they're up to date. You can also check the angular versions and packages in the package.json folder in your project.

I checked my dependencies and packages and installed cordova. Restarted atom and the error went away. Hope this helps!

Answer 5

Beware of auto imports. my HTTP_INTERCEPTORS was auto imported like this:

import { HTTP_INTERCEPTORS } from '@angular/common/http/src/interceptor';

instead of

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

which caused this error

Answer 6

I was using http in angular 5 that was a problem. Using Httpclient resolved the issue.