base64encode in different languages

csharp1.cs

var cleartext = "Hello World";
var b64encoded = Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(cleartext));
// b64encoded now contains SGVsbG8gV29ybGQh
   

javascript1.js

let cleartext = "Hello World!";
let b64encoded = btoa(cleartest);
// b64econded now contains SGVsbG8gV29ybGQh

python1.py

import base64
cleartext ="Hello World!"
b64encoded = base64.b64encode(cleartext.encode('ascii'))
# b64encoded now contains SGVsbG8gV29ybGQh