Angular 13 Service Tutorial with Example

Hello,

This is a short guide on how to create service in angular 13. i explained simply step by step angular 13 create service in folder. We will look at example of angular 13 create service httpclient. you will learn angular 13 cli command to create service. Let's get started with angular 13 cli command to generate service.

Every App must important to sending api request to another server. we can use http client request and get data and store data information to our server. as specially when you are working with angular, vue, react application. you must have to learn how to run http client request with angular 13.

Here, i will give you very simple example to get all data using api and store data using api. we will use jsonplaceholder api for testing now. so we don't require to create new api for it.

So, let's see bellow example step by step how to create http service and how to use it.

Step 1: Create New App

You can easily create your angular app using bellow command:

ng new my-new-app

Step 2: Import HttpClientModule

In this step, we need to import HttpClientModule to app.module.ts file. so let's import it as like bellow:

src/app/app.module.ts

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 { }

Step 3: Create Service for API

Here, we need to create service for http client request. we will create service file and write client http request code. this service will use in our component file. So let's create service and put bellow code:

ng g s services/post

Now let's add code as like bellow:

src/app/services/post.service.ts

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
  
@Injectable({
  providedIn: 'root'
})
export class PostService {
  private url = 'http://jsonplaceholder.typicode.com/posts';
   
  constructor(private httpClient: HttpClient) { }
  
  getPosts(){
    return this.httpClient.get(this.url);
  }
  
}

Step 4: Use Service to Component

Now we have to use this services to our app component. So let's updated code as like bellow:

src/app/app.component.ts

import { Component, OnInit } from '@angular/core';
import { PostService } from './services/post.service';
  
@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
  posts:any;
  
  constructor(private service:PostService) {}
  
  ngOnInit() {
      this.service.getPosts()
        .subscribe(response => {
          this.posts = response;
        });
  }
}

Step 5: Updated View File

Now here, we will updated our html file. let's put bellow code:

src/app/app.component.html

<h1>Angular 13 HttpClient for Sending Http Request Example - ItSolutionStuff.com</h1>
  
<ul class="list-group">
  <li 
      *ngFor="let post of posts"
      class="list-group-item">
      {{ post.title }}
  </li>
</ul>

Run Angular App:

All the required steps have been done, now you have to type the given below command and hit enter to run the Angular app:

ng serve

Now, Go to your web browser, type the given URL and view the app output:

http://localhost:4200

you will see layout as bellow:

I hope it can help you...