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John Peter
Pune, Maharashtra, India
Base64 encode and decode using btoa() and atob() methods in javascript with example
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Atob() and btoa() 
window.atob() method is used to encode string to base64.
window.btoa() method is used to decode base64 to string.

Syntax to use atob and btoa methods in Javascript
window.atob([Normal String])
window.btoa([Base64 encoded String])
Example
<html>
    <head>
        <script type="text/javascript">
            var myNameIs = "babu";

            document.getElementById("txtarea_1").value = window.atob(myNameIs);
            document.getElementById("txtarea_2").value = window.btoa(document.getElementById("txtarea_1").value);
        </script>
    </head>
    <body>
        <textarea id="txtarea_1"></textarea>
        <textarea id="txtarea_2"></textarea>
    </body>
</html>
Output 
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