The `JsonPipe` in Angular 17 is a built-in pipe that helps you display the JSON representation of a value within your templates. Here’s how to use it:
1. Import the `JsonPipe`:-
In the component or service file where you want to use the pipe, import it from the `@angular/common` module:
import { Component } from '@angular/core';
import { JsonPipe } from '@angular/common';
2. Inject the `JsonPipe` (optional):
If you plan to use the pipe multiple times throughout your component, consider injecting it into the component’s constructor:
@Component({
selector: 'app-my-component',
templateUrl: './my-component.component.html',
styleUrls: ['./my-component.component.css']
})
export class MyComponent {
data: any = { name: 'John Doe', age: 30, city: 'New York' };
constructor(private jsonPipe: JsonPipe) {}
getJsonString() {
return this.jsonPipe.transform(this.data);
}
}
3. Use the pipe in your template:
In your component’s template, use the pipe syntax alongside the value you want to convert to JSON:
<p>Data: {{ data }}</p>
<p>JSON representation: {{ data | json }}</p>
<p>Another way: {{ getJsonString() }}</p>
Explanation:
1. The `{{ data }}` expression displays the original value of the `data` object.
2. The `{{ data | json }}` expression applies the `JsonPipe` and displays the JSON representation of the `data` object.
3. If the pipe is injected, you can call a method like `getJsonString()` to retrieve the formatted JSON string and display it using interpolation.