Answers for "failed to execute 'atob' on 'window': the string to be decoded is not correctly encoded."

failed to execute 'atob' on 'window': the string to be decoded is not correctly encoded.

function utf8_to_b64( str ) {
    return window.btoa(unescape(encodeURIComponent( str )));
}

function b64_to_utf8( str ) {
    return decodeURIComponent(escape(window.atob( str )));
}

// Usage:
utf8_to_b64('✓ à la mode'); // "4pyTIMOgIGxhIG1vZGU="
b64_to_utf8('4pyTIMOgIGxhIG1vZGU='); // "✓ à la mode"

failed to execute 'atob' on 'window': the string to be decoded is not correctly encoded.

function b64DecodeUnicode(str) {
        // Going backwards: from bytestream, to percent-encoding, to original string.
        return decodeURIComponent(atob(str).split('').map(function(c) {
            return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2);
        }).join(''));
    }
    
    b64DecodeUnicode('4pyTIMOgIGxhIG1vZGU='); // "✓ à la mode"
    b64DecodeUnicode('Cg=='); // "\n"

failed to execute 'atob' on 'window': the string to be decoded is not correctly encoded.

function fromBinary(encoded) {
  binary = atob(encoded)
  const bytes = new Uint8Array(binary.length);
  for (let i = 0; i < bytes.length; i++) {
    bytes[i] = binary.charCodeAt(i);
  }
  return String.fromCharCode(...new Uint16Array(bytes.buffer));
}

// our previous Base64-encoded string
let decoded = fromBinary(encoded) // "✓ à la mode"