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It is possible generate a service with angular cli and add it as a provider in the app.module.ts in a single step or using an special option in the ng g service command?

When a execute:

$ ng g service services/backendApi
installing service
  create src/app/services/backend-api.service.spec.ts
  create src/app/services/backend-api.service.ts
  WARNING Service is generated but not provided, it must be provided to be used

Next to it, (and according to the WARNING message) I usually add it to provider section on app.module.ts using the text editor:

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

It is possible to do it with a single step, to automatize this?

It is possible generate a service with angular cli and add it as a provider in the app.module.ts in a single step or using an special option in the ng g service command?

When a execute:

$ ng g service services/backendApi
installing service
  create src/app/services/backend-api.service.spec.ts
  create src/app/services/backend-api.service.ts
  WARNING Service is generated but not provided, it must be provided to be used

Next to it, (and according to the WARNING message) I usually add it to provider section on app.module.ts using the text editor:

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

It is possible to do it with a single step, to automatize this?

• javascript
• typescript
• angular-cli

Share Improve this question Follow edited Aug 14, 2017 at 19:46 Xameer 31.2k2727 gold badges146146 silver badges229229 bronze badges asked Mar 12, 2017 at 14:44 Pablo Ezequiel InchaustiPablo Ezequiel Inchausti 20.4k77 gold badges3030 silver badges4444 bronze badges

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10 Answers 10

Sorted by: Reset to default 119

Actually, it is possible to provide the service (or guard, since that also needs to be provided) when creating the service.

The command is the following...

ng g s services/backendApi --module=app.module

Edit

It is possible to provide to a feature module, as well, you must give it the path to the module you would like.

ng g s services/backendApi --module=services/services.module

Angular 6+ Singleton Services

The recommended approach for a singleton service for Angular 6 and beyond is :

import { Injectable } from '@angular/core';

@Injectable({
  providedIn: 'root',
})
export class UserService {
}

In fact the CLI --module switch doesn't even exist any more for registering a service at the app level because it doesn't need to modify app.module.ts anymore.

This will create the above code, without needing to specify a module.

ng g s services/user

So if you don't want your service to be a singleton you must remove the providedIn code yourself - and then add it manually to providers for a component or lazy loaded module. Doesn't look like there is currently a switch to not generate the providedIn: 'root' part so you need to manually remove it.

Looks like in Angular v11 and higher, we don't have option "s" anymore:

ng g service services/backendApi

or like that:

ng g service services/backendApi --flat --skipTests=true

Specify paths

--app
  --one
    one.module.ts
    --services

  --two
    two.module.ts
    --services

Create Service with new folder in module ONE

ng g service one/services/myNewServiceFolderName/serviceOne --module one/one

--one
  one.module.ts // service imported and added to providers.
  --services
    --myNewServiceFolderName
      serviceOne.service.ts
      serviceOne.service.spec.ts

slight change in syntax from the accepted answer for Angular 5 and angular-cli 1.7.0

ng g service backendApi --module=app.module

Add a service to the Angular 4 app using Angular CLI

An Angular 2 service is simply a javascript function along with it's associated properties and methods, that can be included (via dependency injection) into Angular 2 components.

To add a new Angular 4 service to the app, use the command ng g service serviceName. On creation of the service, the Angular CLI shows an error:

To solve this, we need to provide the service reference to the src\app\app.module.ts inside providers input of @NgModule method.

Initially, the default code in the service is:

import { Injectable } from '@angular/core';

@Injectable()
export class ServiceNameService {

  constructor() { }

}

A service has to have a few public methods.

In Angular 5.12 and latest Angular CLI, do

ng generate service my-service -m app.module

ng generate service userService

//shorthand for creating service
ng g s serviceName

** When you fire this command it will automatically registered inside providers array. **

providers: [
    UserService
]

In Command prompt go to project folder and execute following:

ng g s servicename

run the below code in Terminal

makesure You are inside your project folder in terminal

ng g s servicename --module=app.module

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