angular2 pipe to call the keys of json properties

keys.pipe.ts

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

@Pipe({name: 'keys'})
export class KeysPipe implements PipeTransform {
	transform(value) : any {
		let keys = [];
		for (let key in value) {
			keys.push({key: key, value: value[key]});
		}
		return keys;
	}
}

// <div *ngFor="let property of properties | keys">