check if an item id exists in javascript

HTML

<div id="id1">id1</div>
<div id="id2x">id2x</div>

Javascript

var id1 = document.getElementById("id1");
if(id1){
  var id1val= id1.value;
  console.log("id1 exists: " + id1val);
} else {
  console.log("id1 missing");
}

var id2 = document.getElementById("id2");
if(id2){
  var id2val= id2.value;
  console.log("id2 exists: " + id2val);
} else {
  console.log("id2 missing");
}