@se-oss/base64 is a robust and high-performance Base64 library for TypeScript, providing a comprehensive set of tools for encoding and decoding with support for URL-safe strings, Uint8Array conversion, and a class-based API.

• Installation
• Usage
• Performance
• Documentation
• Contributing
• License

📦 Installation

npm install @se-oss/base64

pnpm

pnpm install @se-oss/base64

yarn

yarn add @se-oss/base64

📖 Usage

Basic Usage

Simple encoding and decoding of UTF-8 strings.

import { decode, encode } from '@se-oss/base64';

const encoded = encode('Hello, world!'); // 'SGVsbG8sIHdvcmxkIQ=='
const decoded = decode(encoded); // 'Hello, world!'

URL-Safe Encoding

Easily handle Base64 for URLs by using the URL-safe alphabet.

import { decodeURL, encodeURL } from '@se-oss/base64';

const encoded = encodeURL('a+b/c='); // 'YStiL2M9'
const decoded = decodeURL(encoded);

Uint8Array Support

Native support for Uint8Array conversion without intermediate string overhead where possible.

import { fromUint8Array, toUint8Array } from '@se-oss/base64';

const bytes = new Uint8Array([72, 101, 108, 108, 111]);
const encoded = fromUint8Array(bytes);
const decoded = toUint8Array(encoded);

Streaming API

Handle large datasets efficiently using Web TransformStream to encode or decode data in chunks.

import { Base64EncodeStream } from '@se-oss/base64';

const stream = new ReadableStream({
  start(controller) {
    controller.enqueue('Hello');
    controller.enqueue(' World');
    controller.close();
  },
});

const encodedStream = stream.pipeThrough(new Base64EncodeStream());

Prototype Extensions

Opt-in to extend native prototypes for a more fluent and convenient API.

import '@se-oss/base64/extend';

'Hello'.toBase64();
'SGVsbG8='.fromBase64();
new Uint8Array([72, 101]).toBase64();

Validation

Verify if a string is a valid Base64 or URL-safe Base64 encoded string.

import { isValid, isValidURL } from '@se-oss/base64';

isValid('SGVsbG8='); // true
isValidURL('YStiL2M'); // true

Data URL

Helper functions for generating and parsing Data URLs.

import { fromDataURL, toDataURL } from '@se-oss/base64';

const dataUrl = toDataURL('Hello', 'text/plain');
const { data, mimeType } = fromDataURL(dataUrl);

Advanced Options

Omit padding characters for cleaner strings or specify URL-safety in generic functions.

import { encode } from '@se-oss/base64';

const unpadded = encode('Hello', { omitPadding: true }); // 'SGVsbG8'

🚀 Performance

The benchmarks are run against the native btoa/atob functions and the popular js-base64 library.

| Function | @se-oss/base64 (ops/sec) | js-base64 (ops/sec) | Native (ops/sec) | | :--------------- | :----------------------- | :------------------ | :--------------- | | encode | 3,920.79 | 3,521.89 | 2,139.68 | | decode | 3,267.53 | 761.08 | 3,169.99 | | fromUint8Array | 3,577.44 | 3,821.32 | - | | toUint8Array | 3,961.72 | 762.16 | - | | toDataURL | 3,558.89 | - | - | | fromDataURL | 1,218.19 | - | - |

Benchmark script: bench/index.bench.ts

📚 Documentation

For all configuration options, please see the API docs.

🤝 Contributing

Want to contribute? Awesome! To show your support is to star the project, or to raise issues on GitHub.

Thanks again for your support, it is much appreciated! 🙏

License

MIT © Shahrad Elahi and contributors.