indexOf example
by dshilkret
HTML
<!DOCTYPE html>
<html>
<body>
<h1>The Window Object</h1>
<h2>The atob() Method</h2>
<p>The atob() method decodes a base-64 encoded string.</p>
<p>The atob() method is not supported in IE9 and earlier.</p>
<p id="demo"></p>
<script>
let text = "eyJhbGciOiJub25lIiwgInR5cCI6IkpXVCJ9.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.";
//let encoded = window.btoa(text);
let decoded =...
JavaScript
var myString=...