atob() method to decode a Base64-encoded string back to its original form.
// ES5+ const decodedStr = atob('Zm9vYmFy'); console.log(decodedStr); // 'foobar'
Please note that you may have to do some additional work to decode a multibyte encoded string.
Passing invalid base64 strings to
atob() will throw an error. For example, the following string contains an invalid character (
_) and would throw an error:
// ES5+ // Uncaught DOMException: Failed to execute 'atob' on 'Window': The string to be decoded is not correctly encoded. atob('8J+mig__');
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