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

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 follow:

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

When I try this in my project, I get the following error: "Cannot find module '@angular/common/http'".

I have tried importing the following module, as follow:

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

And then my imports section:

imports: [
    HttpModule
],

The problem now is, I cannot inject this HttpModule into my service object, and I get the following error: "Cannot find module HttpModule".

Here is my service class:

import { Injectable, OnInit } from '@angular/core';
//Custom Models
import { Feed } from '../Models/Feed';

@Injectable()
export class FeedsService {
    constructor(private httpClient: HttpModule) {}
}

What am I doing wrong?

Update All I should have done when I realized I could not import the module as per the tutorial, was to run the npm update command, to update all my packages.

Solution 1:

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

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

Solution 2:

Important Update:

HttpModule and Http from @angular/http has been deprecated since Angular V5, should of using HttpClientModule and HttpClient from @angular/common/http instead, refer CHANGELOG.

For Angular version previous from **@4.3.0, You should inject Http from @angular/http, and HttpModule is for importing at your NgModule's import array.

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

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

Inject http at component or service

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

constructor(private http: Http) {}

For Angular version after(include) 4.3.0, you can use HttpClient from @angular/common/http instead of Http from @angular/http. Don't forget to import HttpClientModule at your NgModule's import array first.

Refer @echonax's answer.

Solution 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);
}