# The charCodeAt() method returns a number representing the Unicode value of the character at the given index. Unicode code points range from 0 to 1,114,111. The first 128 Unicode code points directly match the ASCII character encoding.
charCodeAt(index) supports the following parameters:
- index - an integer between 0 and the length of the string minus 1; if not specified, Default is 0.
Example
You can try running the following code to return a number representing the Unicode value of a character:
<html>
<head>
<title>JavaScript String charCodeAt() Method</title>
</head>
<body>
<script>
var str = new String( "This is string" );
document.write("str.charCodeAt(0) is:" + str.charCodeAt(0));
document.write("<br />str.charCodeAt(1) is:" + str.charCodeAt(1));
document.write("<br />str.charCodeAt(2) is:" + str.charCodeAt(2));
document.write("<br />str.charCodeAt(3) is:" + str.charCodeAt(3));
document.write("<br />str.charCodeAt(4) is:" + str.charCodeAt(4));
document.write("<br />str.charCodeAt(5) is:" + str.charCodeAt(5));
</script>
</body>
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