Base64 encoding and decoding in client-side Javascript

Question

Are there any methods in JavaScript that could be used to encode and decode a string using base64 encoding?

Answer 1

Modern browsers have built-in javascript functions for Base64 encoding btoa() and decoding atob(). More info about support in older browser versions: https://caniuse.com/?search=atob

However, be aware that atob and btoa functions work only for ASCII charset. If you need Base64 functions for UTF-8 charset, you can do it with:

function base64_encode(s) {      
    return btoa(unescape(encodeURIComponent(s)));
}
function base64_decode(s) {      
    return decodeURIComponent(escape(atob(s)));
}