hasOwnProperty()

The hasOwnProperty() method returns a boolean indicating whether the object has the specified property.

HTML

<pre id="id"></pre>

JavaScript

var obj = [
	{
  	name: 'Mike'
  }
]

var check = obj[0].hasOwnProperty('name')
var check2 = obj[0].hasOwnProperty('noname')

document.getElementById('id').innerHTML = obj[0].name;
document.getElementById('id').innerHTML += '<br>' + check;
document.getElementById('id').innerHTML += '<br>' + check2;
document.getElementById('id').innerHTML += '<br>' + ;