angular-docs-cn/modules/@angular/common/src/pipes/json_pipe.ts

/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

import {Pipe, PipeTransform} from '@angular/core';

import {Json} from '../facade/lang';



/**
 * @ngModule CommonModule
 * @whatItDoes Converts value into JSON string.
 * @howToUse `expression | json`
 * @description
 *
 * Converts value into string using `JSON.stringify`. Useful for debugging.
 *
 * ### Example
 * {@example common/pipes/ts/json_pipe.ts region='JsonPipe'}
 *
 * @stable
 */
@Pipe({name: 'json', pure: false})
export class JsonPipe implements PipeTransform {
  transform(value: any): string { return Json.stringify(value); }
}