how to read json object in javascript code example

Example 1: JavaScript read as Json

// The JSON.parse() method parses a JSON string, constructing the JavaScript value or object described by the string.
// An optional reviver function can be provided to perform a transformation on the resulting object before it is returned.

//NOTE: JSON.parse() does not allow single quotes around items

//Example: 
var obj = JSON.parse('{ "name":"John", "age":30, "city":"New York"}');

Example 2: javascript parse json

var jsonPerson = '{"first_name":"billy", "age":23}';
var personObject = JSON.parse(jsonPerson); //parse json string into JS object

Example 3: json parse

<!DOCTYPE html>
<html>
<body>
<h2>Convert a string into a date object.</h2>
<p id="demo"></p>
<script>
var text = '{"name":"John", "birth":"1986-12-14", "city":"New York"}';
var obj = JSON.parse(text);
obj.birth = new Date(obj.birth);
document.getElementById("demo").innerHTML = obj.name + ", " + obj.birth; 
</script>
</body>
</html>