No provider for Http StaticInjectorError

Question

I am trying to pull the data from my api  and populate it in my ionic app  but it is crashing when I enter the page the data should be populated on   Below are my two  ts files   import   Component   from   angular core    import   NavController  LoadingController   from  ionic-angular   import   RestService   from        providers rest-service rest-service     Component     selector   page-all-patients     templateUrl   all-patients html     providers   RestService     export class AllPatientsPage     data  any    loading  any     constructor public navCtrl  NavController  public restService  RestService  public loadingCtrl  LoadingController         this loading   this loadingCtrl create         content             lt ion-spinner gt  lt  ion-spinner gt               this getdata           getdata         this loading present        this restService getJsonData   subscribe        result   gt            this data result data children          console log  Success      this data                  err   gt            console error  Error       err                       gt            this loading dismiss            console log  getData completed                        and the other file   import   Http   from   angular http   import   Injectable   from   angular core   import  rxjs add operator map         Generated class for the RestServiceProvider provider     See https   angular io guide dependency-injection for more info on providers   and Angular DI       Injectable   export class RestService      constructor public http  Http        console log  Hello RestServiceProvider Provider           getJsonData            return Promise resolve this data         return this http get  url   map res   gt  res json               I have tried using the HttpModule as well  but it is a fatal error  The error is as shows   Error  Uncaught  in promise   Error  StaticInjectorError Http      StaticInjectorError Http        NullInjectorError  No provider for Http  Error  StaticInjectorError Http      StaticInjectorError Http        NullInjectorError  No provider for Http      at  NullInjector get  http   lndapp wpi edu 8100 build vendor js 1276 19    I am unsure why there is a no provider error  as this is the provider created through ionic framework

User · Answer

In ionic 4 6 I use the following technique and it works  I am adding this answer so that if anybody is facing similar issues in newer ionic version app  it may help them   i  Open app module ts and add the following code block to import HttpModule and HttpClientModule  import   HttpModule   from   angular http   import     HttpClientModule   from   angular common http     ii  In  NgModule import sections add below lines   HttpModule  HttpClientModule    So  in my case  NgModule  looks like this    NgModule     declarations   AppComponent      entryComponents         imports        BrowserModule      HttpModule      HttpClientModule      IonicModule forRoot        AppRoutingModule          providers        StatusBar      SplashScreen        provide  RouteReuseStrategy  useClass  IonicRouteStrategy          bootstrap   AppComponent       That s it

User · Answer

I am on an angular project that  unfortunately  uses source code inclusion via tsconfig json to connect different collections of code   I came across a similar StaticInjector error for a service  e g RestService in the top example  and I was able to fix it by listing the service dependencies in the deps array when providing the affected service in the module  for example   import   HttpClient   from   angular common http   import   NgModule   from   angular core   import   HttpModule   from   angular http   import   RestService   from  mylib src rest rest service        NgModule     imports                HttpModule                 providers                provide  RestService        useClass  RestService        deps   HttpClient     the injected services in the constructor for RestService

User · Answer

Update  Angular v6    For Apps converted from older versions  Angular v2 - v5   HttpModule is now deprecated and you need to replace it with HttpClientModule or else you will get the error too     In your app module ts replace import   HttpModule   from   angular http   with the new HttpClientModule import   HttpClientModule  from   angular common http   Note  Be sure to then update the modules imports   array by removing the old HttpModule and replacing it with the new HttpClientModule  In any of your services that used HttpModule replace import   Http   from   angular http   with the new HttpClient import   HttpClient   from   angular common http   Update how you handle your Http response  For example - If you have code that looks like this  http get  people json   subscribe  res Response    gt  this people   res json       The above code example will result in an error  We no longer need to parse the response  because it already comes back as JSON in the config object      The subscription callback copies the data fields into the component s config object  which is data-bound in the component template for display     For more information please see the - Angular HttpClientModule - Official Documentation

User · Answer

Add these two file in your app module ts   import   FileTransfer   from   ionic-native file-transfer   import   File   from   ionic-native file     after that declare these to in provider    providers        Api      Items      User      Camera      File      FileTransfer     This is work for me

User · Answer

You would need also to import the HttpClientModule from Angular   angular common http  into your main AppModule for making HTTP requests   app module ts  import   HttpClientModule   from   angular common http   import   ServiceService   from           services service service     NgModule      imports           HttpClientModule          providers           ServiceService         export class AppModule

User · Answer

In order to use Http in your app you will need to add the HttpModule to your app module ts   import   BrowserModule   from   angular platform-browser   import   NgModule  ErrorHandler   from   angular core   import   HttpModule   from   angular http         imports        BrowserModule      HttpModule      IonicModule forRoot MyApp       IonicStorageModule forRoot         EDIT  As mentioned in the comment below  HttpModule is deprecated now  use import   HttpClientModule   from   angular common http   Make sure HttpClientModule in your imports    array

User · Answer

I was trying to fix the issue for about an hour and just deiced to restart the server  Only to see the issue is fixed    If you make changes to APP module and the issue remains the same  stop the server and try running the serve command again   Using ionic 4 with angular 7

[angular] No provider for Http StaticInjectorError

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