RFC 4648 Base64 Decoder & Binary Reconstructor

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Programmatic Code Snippets: Base64 Decode String

How to implement Base64 Decode String programmatically in Python, Node.js, PHP, and CLI

CLI & API Syntax

Decode base64 string to utf-8 in Python 3

import base64

encoded_str = "SGVsbG8gV29ybGQhIFRvb2xib3gyNA=="
decoded_bytes = base64.b64decode(encoded_str)
decoded_text = decoded_bytes.decode('utf-8')
print(decoded_text) # Output: Hello World! Toolbox24

Decode base64 using native Buffer in Node.js / JavaScript

const encodedStr = "SGVsbG8gV29ybGQhIFRvb2xib3gyNA==";
const decodedStr = Buffer.from(encodedStr, 'base64').toString('utf-8');
console.log(decodedStr); // Output: Hello World! Toolbox24

Decode base64 string natively in PHP

<?php
$encoded_str = "SGVsbG8gV29ybGQhIFRvb2xib3gyNA==";
$decoded_str = base64_decode($encoded_str);
echo $decoded_str; // Output: Hello World! Toolbox24

Decode base64 in Linux / macOS Terminal

echo "SGVsbG8gV29ybGQhIFRvb2xib3gyNA==" | base64 --decode
# macOS alternative: echo "SGVsbG8gV29ybGQhIFRvb2xib3gyNA==" | base64 -D

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