• C#

string s = Convert.ToBase64String(data);

• Dart

var s = base64.encode(data);

• Go

s := base64.StdEncoding.EncodeToString(data)

• Groovy

final s = data.encodeBase64().toString()

• JS

let s = btoa(data);

• Java

byte data[] = s.getBytes();
String s = getEncoder().encodeToString(data);

• Pascal

s := EncodeStringBase64(data);

• Perl

$encoded = encode_base64('Aladdin:open sesame');
$decoded = decode_base64($encoded);

• Python

b = base64.b64encode(data)
s = b.decode()

• Ruby

s = Base64.strict_encode64(data)

• Rust

let s = base64::encode(data);

• Scheme

(base64-encode
 (list->bytes
  (map char->integer
       (string->list "hi there"))))

• VB

Dim s As String = Convert.ToBase64String(data)