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.

npm install --save tiny-msgpack

constmsgpack=require('tiny-msgpack');constuint8array=msgpack.encode({foo: 'bar',baz: 123});constobject=msgpack.decode(uint8array);

for(constobjectofmsgpack.decodeEach(uint8array)){console.log(object);}

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.

constmsgpack=require('tiny-msgpack');functionencodeDate(date){returnmsgpack.encode(Number(date));}functiondecodeDate(uint8array){returnnewDate(msgpack.decode(uint8array));}constcodec=newmsgpack.Codec();codec.register(0xff,Date,encodeDate,decodeDate);constuint8array=msgpack.encode({timestamp: newDate()},codec);constobject=msgpack.decode(uint8array,codec);console.log(object.timestampinstanceofDate);// => true

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+

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).

MIT