btoa() method only supports characters that can be represented using a single byte (8-bits). This means that it only supports a total of 256 characters from the following character sets:
- 128 characters of the ASCII character set, and;
- 128 characters of the Latin-1 (ISO-8859-1) character set.
// ES5+ const encodedStr = btoa('foobar'); console.log(encodedStr); // 'Zm9vYmFy'
If you pass a string that is not in this range to the
btoa() method, it will throw an error:
// ES5+ // Uncaught DOMException: Failed to execute 'btoa' on 'Window': The string to be encoded contains characters outside of the Latin1 range. btoa('🦊');
To support multibyte strings, you can convert the original string to binary format so that it can be used with the
btoa() method for Base64 encoding.
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