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tiny-msgpack Build Status

A minimalistic MessagePack encoder and decoder for JavaScript.

  • Tiny Size (3.95 kB minified and gzipped)
  • Fast performance
  • Extension support
  • No other bells or whistles

By default, msgpack can encode numbers, bigints, strings, booleans, nulls, arrays, objects, and binary data (Uint8Array in browsers, Buffer in Node.js). However, additional types can be registered by using extensions.

Installation

npm install --save tiny-msgpack

Usage

const msgpack = require('tiny-msgpack');

const uint8array = msgpack.encode({ foo: 'bar', baz: 123 });
const object = msgpack.decode(uint8array);

Decoding multiple concatenated messages

for (const object of msgpack.decodeEach(uint8array)) {
	console.log(object);
}

BigInts

You can encode 64-bit integers by using BigInt. Likewise, decoding a 64-bit integer will result in a BigInt. If BigInt is not supported on your platform, decoding a 64-bit integer will throw an exception.

Extensions

const msgpack = require('tiny-msgpack');

function encodeDate(date) {
  return msgpack.encode(Number(date));
}

function decodeDate(uint8array) {
  return new Date(msgpack.decode(uint8array));
}

const codec = new msgpack.Codec();
codec.register(0xff, Date, encodeDate, decodeDate);

const uint8array = msgpack.encode({ timestamp: new Date() }, codec);
const object = msgpack.decode(uint8array, codec);

console.log(object.timestamp instanceof Date); // => true

Browser Support

In the browser, tiny-msgpack requires the Encoding API, which is only supported by modern browsers. However, if you polyfill it, this package is supported by the following browsers:

  • Chrome 9+
  • Firefox 15+
  • Safari 5.1+
  • Opera 12.1+
  • Internet Explorer 10+

Zero copy

In the MessagePack format, binary data is encoded as... binary data! To maximize performance, tiny-msgpack does not copy binary data when encoding or decoding it. So after decoding, the contents of a returned Uint8Array can be affected by modifying the input Uint8Array (the same can happen with encoding).

License

MIT