Angular 5 Service To Read Local Json File

When working on web development projects with Angular, you may often come across the need to read and utilize data from local JSON files. This can be a handy way to store and access information required for your application. In this article, we will explore how to create a service in Angular 5 that can efficiently read a local JSON file.

To get started, let's first understand the basic structure of an Angular service. Services in Angular are commonly used to encapsulate reusable functionality that is independent of components. This helps in maintaining clean code architecture and promoting code reusability.

Now, let's dive into creating a service specifically designed to read local JSON files.

### Step 1: Set Up Your Angular Environment
Ensure you have Angular CLI installed. If not, you can install it using npm by running the following command:

Bash

npm install -g @angular/cli

### Step 2: Create a New Service
To create a new service that reads local JSON files, you can use the Angular CLI. Open your terminal and run the following command:

Bash

ng generate service json-reader

This command will generate a new service file named `json-reader.service.ts`.

### Step 3: Implement the Service
Open the generated service file (`json-reader.service.ts`) in your code editor and implement the following code snippet:

Typescript

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';

@Injectable({
  providedIn: 'root'
})
export class JsonReaderService {
  constructor(private http: HttpClient) { }

  getJsonData() {
    return this.http.get('assets/data/data.json');
  }
}

In the code above, we have created a service named `JsonReaderService` that utilizes Angular's `HttpClient` module to fetch data from a local JSON file (`data.json` in the `assets/data` directory).

### Step 4: Utilize the Service in Your Component
To use the service we created, inject it into the component where you want to read the JSON data. Here's an example of how you can consume the service in a component:

Typescript

import { Component, OnInit } from '@angular/core';
import { JsonReaderService } from './json-reader.service';

@Component({
  selector: 'app-example',
  templateUrl: './example.component.html',
  styleUrls: ['./example.component.css']
})
export class ExampleComponent implements OnInit {
  constructor(private jsonReaderService: JsonReaderService) { }

  ngOnInit() {
    this.jsonReaderService.getJsonData().subscribe(data =&gt; {
      console.log(data);
    });
  }
}

In this component, we inject `JsonReaderService` in the constructor and call the `getJsonData()` method to fetch and log the JSON data in the console.

By following these steps, you can easily create an Angular service to read local JSON files in your application. This approach can be particularly useful when dealing with static data that needs to be dynamically loaded into your Angular application. Happy coding!

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