Cross-runtime base64/base64url library for Deno, Bun, and Node.js

Based on @hexagon/base64 but adapted to TypeScript and jsr.io, dropping all the legacy tooling. Part of the @cross suite - check out our growing collection of cross-runtime tools at github.com/cross-org.

NOTE: If not bound to the specific features of this library (like validation, or decoding directly to a string), you might be better off using https://jsr.io/@std/encoding.

Key Features:

• Encode and decode Base64 data in Deno, Node.js, Bun, and your favorite browsers.
• Works with both regular Base64 and Base64url.
• Smoothly convert between strings and ArrayBuffers.
• Check the validity of Base64 and Base64url strings.
• TypeScript typings included.

Installation:

See jsr.io/@cross/base64

Usage:

// See jsr.io/@cross/base64 for installation instructions
import { fromString, toString } from "jsr:@cross/base64";

// Encode string as regular base64
// - Use the second parameter to enable/disable base64url
const example1enc = fromString("Hellö Wörld, how are you doing today?!", true);
console.log(example1enc);
// > SGVsbMO2IFfDtnJsZCwgaG93IGFyZSB5b3UgZG9pbmcgdG9kYXk_IQ

// Decode string as regular base64
// - Use the second parameter to enable/disable base64url
const example1dec = toString("SGVsbMO2IFfDtnJsZCwgaG93IGFyZSB5b3UgZG9pbmcgdG9kYXk_IQ", true);
console.log(example1dec);
// > Hellö Wörld, how are you doing today?!
//