base64-tool

@devkits/base64-tool

Encode and decode Base64 strings with UTF-8 support. Simple, fast, zero-dependency Base64 utility for Node.js and browsers.

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This package is part of DevKits — 82+ free developer tools. The online Base64 tool supports file upload, batch encoding, and URL-safe variants.

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Installation

npm install @devkits/base64-tool

Usage

const { encode, decode, encodeURLSafe, isValidBase64 } = require('@devkits/base64-tool');

// Encode a string to Base64
const encoded = encode('Hello, 世界!');
// 'SGVsbG8sIOS4lueVjCE='

// Decode Base64 back to string
const decoded = decode('SGVsbG8sIOS4lueVjCE=');
// 'Hello, 世界!'

// URL-safe Base64 (no padding, replaces + and /)
const urlSafe = encodeURLSafe('Hello+World/Test');
// 'SGVsbG8rV29ybGRfVGVzdA'

// Validate Base64 strings
isValidBase64('SGVsbG8='); // true
isValidBase64('invalid!!'); // false

API

encode(input)

Encodes a string to Base64 with UTF-8 support.

decode(input)

Decodes a Base64 string with UTF-8 support. Throws an error for invalid input.

encodeURLSafe(input)

Encodes a string to URL-safe Base64 (uses - and _ instead of + and /, no padding).

isValidBase64(input)

Checks if a string is valid Base64 (standard or URL-safe format).

Features

• UTF-8 support (works with Chinese, Japanese, Korean, emojis, etc.)
• URL-safe Base64 encoding
• Base64 validation
• Zero dependencies
• Works in Node.js and browsers
• TypeScript-friendly (JSDoc comments included)

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License

MIT