I came to know by printing it into a console. Below is the code of the same.

AmazonKeyEvent(ev: any) {
 this.keyName = ev.key;
 console.log('Which key pressed:', this.keyName);
case 'Enter':
 break;
 case 'ArrowDown':
 break;
}

I pressed enter key once but it show sometime pressed 2 or more times. Can anyone suggest me how to overcome this issue by calling pressed button 1 time only ?