JavaScript - Base64 encode and decode

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In this article, we would like to show you how to encode and decode Base64 in JavaScript.

Quick solution:

// ONLINE-RUNNER:browser;

const text = 'some text...';

const encoded = btoa(text);
console.log('Encoded text: ' + encoded);  // c29tZSB0ZXh0Li4u

const decoded = atob(encoded);
console.log('Decoded text: ' + decoded);  // some text...


1. Encode

In this example, we use btoa() method to create a Base64-encoded ASCII string.

// ONLINE-RUNNER:browser;

const text = 'some text...';

const encoded = btoa(text);
console.log(encoded);  // c29tZSB0ZXh0Li4u



2. Decode

In this example, we use atob() method to decode a string of data which has been encoded using Base64 encoding.

// ONLINE-RUNNER:browser;

const encoded = 'c29tZSB0ZXh0Li4u';

const decoded = atob(encoded);
console.log(decoded);  // some text...


some text...


  1. atob() - Web APIs | MDN
  2. btoa() - Web APIs | MDN

Alternative titles

  1. JavaScript - Base 64 encode and decode
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