Image ⇄ Base64 Converter

const fs = require('fs');
// Encode file to base64
const b64 = fs.readFileSync('in.png').toString('base64');
// Decode base64 to file
fs.writeFileSync('out.png', Buffer.from(b64, 'base64'));

const file = input.files[0];
const r = new FileReader();
r.onload = () => console.log(r.result); // data:image/png;base64,....
r.readAsDataURL(file);

import base64
b64 = base64.b64encode(open('in.png','rb').read()).decode('ascii')
open('out.png','wb').write(base64.b64decode(b64))

$b64 = base64_encode(file_get_contents('in.png'));
file_put_contents('out.png', base64_decode($b64, true));

import ("encoding/base64"; "os")
b, _ := os.ReadFile("in.png")
s := base64.StdEncoding.EncodeToString(b)
d, _ := base64.StdEncoding.DecodeString(s)
_ = os.WriteFile("out.png", d, 0644)

var bytes = java.nio.file.Files.readAllBytes(java.nio.file.Paths.get("in.png"));
var b64 = java.util.Base64.getEncoder().encodeToString(bytes);
var out = java.util.Base64.getDecoder().decode(b64);
java.nio.file.Files.write(java.nio.file.Paths.get("out.png"), out);

var b64 = Convert.ToBase64String(File.ReadAllBytes("in.png"));
File.WriteAllBytes("out.png", Convert.FromBase64String(b64));

require "base64"
b64 = Base64.strict_encode64(File.binread("in.png"))
File.binwrite("out.png", Base64.decode64(b64))

base64 in.png > out.b64
base64 -d out.b64 > out.png