testing.html:
<!DOCTYPE html>
<html>
<body>
<h2>Create Object from JSON String</h2>
<p>
First Name: <span id="fname"></span><br>
Last Name: <span id="lname"></span><br>
</p>
<script src = smth.json></script>
<script>
var obj = JSON.parse(txt)
document.getElementById("fname").innerHTML=obj.employees[1].firstName
document.getElementById("lname").innerHTML=obj.employees[1].lastName
</script>
</body>
</html>
smth.json:
txt = {
"employees": [
{"firstName":"John",
"lastName":"Doe" },
{"firstName":"Anna",
"lastName":"Smith" },
{"firstName":"Peter",
"lastName":"Jones" }
]};