JavaScript Reference
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Quick Reference

The window.atob() method decodes a base-64 encoded string.

<!-- html element to place output -->
<p id="my_output"></p>
// variables
let text = 'Hello World';
let my_encoded = window.btoa(text);
let my_decoded = window.atob(my_encoded);

// output to the HTML element
document.getElementById('my_output').innerHTML = 'Encoded: ' + my_encoded + '<br>' + 'Decoded: ' + my_decoded;

Output

Encoded: SGVsbG8gV29ybGQ=
Decoded: Hello World

Syntax

window.atob(encoded)

JavaScript Notes:

  • When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
  • JavaScript is a case-sensitive language; firstName is NOT the same as firstname
  • Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
  • JavaScript variables must begin with a letter, $, or _
  • JavaScript variables are case sensitive (x is not the same as X)
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