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msgpack-lite

msgpack-lite npm version Build Status

Fast Pure JavaScript MessagePack Encoder and Decoder

Sauce Test Status

Online demo: http://kawanet.github.io/msgpack-lite/

Features

  • Pure JavaScript only (No node-gyp nor gcc required)
  • Faster than any other pure JavaScript libraries on node.js v4
  • Even faster than node-gyp C++ based msgpack library (90% faster on encoding)
  • Streaming encoding and decoding interface is also available. It's more faster.
  • Ready for Web browsers including Chrome, Firefox, Safari and even IE8
  • Tested on Node.js v0.10, v0.12, v4, v5 and v6 as well as Web browsers

Encoding and Decoding MessagePack

var msgpack = require("msgpack-lite");
 
// encode from JS Object to MessagePack (Buffer) 
var buffer = msgpack.encode({"foo": "bar"});
 
// decode from MessagePack (Buffer) to JS Object 
var data = msgpack.decode(buffer); // => {"foo": "bar"} 
 
// if encode/decode receives an invalid argument an error is thrown 

Writing to MessagePack Stream

var fs = require("fs");
var msgpack = require("msgpack-lite");
 
var writeStream = fs.createWriteStream("test.msp");
var encodeStream = msgpack.createEncodeStream();
encodeStream.pipe(writeStream);
 
// send multiple objects to stream 
encodeStream.write({foo: "bar"});
encodeStream.write({baz: "qux"});
 
// call this once you're done writing to the stream. 
encodeStream.end();

Reading from MessagePack Stream

var fs = require("fs");
var msgpack = require("msgpack-lite");
 
var readStream = fs.createReadStream("test.msp");
var decodeStream = msgpack.createDecodeStream();
 
// show multiple objects decoded from stream 
readStream.pipe(decodeStream).on("data", console.warn);

Decoding MessagePack Bytes Array

var msgpack = require("msgpack-lite");
 
// decode() accepts Buffer instance per default 
msgpack.decode(Buffer([0x81, 0xA3, 0x66, 0x6F, 0x6F, 0xA3, 0x62, 0x61, 0x72]));
 
// decode() also accepts Array instance 
msgpack.decode([0x81, 0xA3, 0x66, 0x6F, 0x6F, 0xA3, 0x62, 0x61, 0x72]);
 
// decode() accepts raw Uint8Array instance as well 
msgpack.decode(new Uint8Array([0x81, 0xA3, 0x66, 0x6F, 0x6F, 0xA3, 0x62, 0x61, 0x72]));

Command Line Interface

A CLI tool bin/msgpack converts data stream from JSON to MessagePack and vice versa.

echo '{"foo": "bar"}' | ./bin/msgpack -Jm | od -tx1
0000000    81  a3  66  6f  6f  a3  62  61  72
 
echo '{"foo": "bar"}' | ./bin/msgpack -Jm | ./bin/msgpack -Mj
{"foo":"bar"}

Installation

$ npm install --save msgpack-lite

Tests

Run tests on node.js:

$ make test

Run tests on browsers:

$ make test-browser-local
open the following url in a browser:
http://localhost:4000/__zuul

Browser Build

Browser version msgpack.min.js is also available. 50KB minified, 14KB gziped.

<!--[if lte IE 9]>
<script src="https://cdnjs.cloudflare.com/ajax/libs/es5-shim/4.1.10/es5-shim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/json3/3.3.2/json3.min.js"></script>
<![endif]-->
<script src="https://rawgit.com/kawanet/msgpack-lite/master/dist/msgpack.min.js"></script>
<script>
// encode from JS Object to MessagePack (Uint8Array)
var buffer = msgpack.encode({foo: "bar"});
 
// decode from MessagePack (Uint8Array) to JS Object
var array = new Uint8Array([0x81, 0xA3, 0x66, 0x6F, 0x6F, 0xA3, 0x62, 0x61, 0x72]);
var data = msgpack.decode(array);
</script> 

MessagePack With Browserify

Step #1: write some code at first.

var msgpack = require("msgpack-lite");
var buffer = msgpack.encode({"foo": "bar"});
var data = msgpack.decode(buffer);
console.warn(data); // => {"foo": "bar"} 

Proceed to the next steps if you prefer faster browserify compilation time.

Step #2: add browser property on package.json in your project. This refers the global msgpack object instead of including whole of msgpack-lite source code.

{
  "dependencies": {
    "msgpack-lite": "*"
  },
  "browser": {
    "msgpack-lite": "msgpack-lite/global"
  }
}

Step #3: compile it with browserify and uglifyjs.

browserify src/main.js -o tmp/main.browserify.js -s main
uglifyjs tmp/main.browserify.js -m -c -o js/main.min.js
cp node_modules/msgpack-lite/dist/msgpack.min.js js/msgpack.min.js

Step #4: load msgpack.min.js before your code.

<script src="js/msgpack.min.js"></script>
<script src="js/main.min.js"></script>

Interoperability

It is tested to have basic compatibility with other Node.js MessagePack modules below:

Benchmarks

A benchmark tool lib/benchmark.js is available to compare encoding/decoding speed (operation per second) with other MessagePack modules. It counts operations of 1KB JSON document in 10 seconds.

$ npm install msgpack msgpack-js msgpack-js-v5 msgpack-unpack msgpack5 notepack
$ npm run benchmark 10
operation op ms op/s
buf = Buffer(JSON.stringify(obj)); 1055200 10000 105520
obj = JSON.parse(buf); 863800 10000 86380
buf = require("msgpack-lite").encode(obj); 969100 10000 96910
obj = require("msgpack-lite").decode(buf); 600300 10000 60030
buf = require("msgpack").pack(obj); 503500 10001 50344
obj = require("msgpack").unpack(buf); 560200 10001 56014
buf = Buffer(require("msgpack.codec").msgpack.pack(obj)); 653500 10000 65349
obj = require("msgpack.codec").msgpack.unpack(buf); 367500 10001 36746
buf = require("msgpack-js-v5").encode(obj); 189500 10002 18946
obj = require("msgpack-js-v5").decode(buf); 408900 10000 40890
buf = require("msgpack-js").encode(obj); 189200 10000 18920
obj = require("msgpack-js").decode(buf); 375600 10002 37552
buf = require("msgpack5")().encode(obj); 110500 10009 11040
obj = require("msgpack5")().decode(buf); 165500 10000 16550
buf = require("notepack")().encode(obj); 847800 10000 84780
obj = require("notepack")().decode(buf); 599800 10000 59980
obj = require("msgpack-unpack").decode(buf); 48100 10002 4809

Streaming benchmark tool lib/benchmark-stream.js is also available. It counts milliseconds for 1,000,000 operations of 30 bytes fluentd msgpack fragment. This shows streaming encoding and decoding are super faster.

$ npm run benchmark-stream 2
operation (1000000 x 2) op ms op/s
stream.write(msgpack.encode(obj)); 1000000 3027 330360
stream.write(notepack.encode(obj)); 1000000 2012 497017
msgpack.Encoder().on("data",ondata).encode(obj); 1000000 2956 338294
msgpack.createEncodeStream().write(obj); 1000000 1888 529661
stream.write(msgpack.decode(buf)); 1000000 2020 495049
stream.write(notepack.decode(buf)); 1000000 1794 557413
msgpack.Decoder().on("data",ondata).decode(buf); 1000000 2744 364431
msgpack.createDecodeStream().write(buf); 1000000 1341 745712

Test environment: msgpack-lite 0.1.14, Node v4.2.3, Intel(R) Xeon(R) CPU E5-2666 v3 @ 2.90GHz

MessagePack Mapping Table

The following table shows how JavaScript objects (value) will be mapped to MessagePack formats and vice versa.

Source Value MessagePack Format Value Decoded
null, undefined nil format family null
Boolean (true, false) bool format family Boolean (true, false)
Number (32bit int) int format family Number (int or double)
Number (64bit double) float format family Number (double)
String str format family String
Buffer bin format family Buffer
Array array format family Array
Map map format family Map (if usemap=true)
Object (plain object) map format family Object (or Map if usemap=true)
Object (see below) ext format family Object (see below)

Note that both null and undefined are mapped to nil 0xC1 type. This means undefined value will be upgraded to null in other words.

Extension Types

The MessagePack specification allows 128 application-specific extension types. The library uses the following types to make round-trip conversion possible for JavaScript native objects.

Type Object Type Object
0x00 0x10
0x01 EvalError 0x11 Int8Array
0x02 RangeError 0x12 Uint8Array
0x03 ReferenceError 0x13 Int16Array
0x04 SyntaxError 0x14 Uint16Array
0x05 TypeError 0x15 Int32Array
0x06 URIError 0x16 Uint32Array
0x07 0x17 Float32Array
0x08 0x18 Float64Array
0x09 0x19 Uint8ClampedArray
0x0A RegExp 0x1A ArrayBuffer
0x0B Boolean 0x1B Buffer
0x0C String 0x1C
0x0D Date 0x1D DataView
0x0E Error 0x1E
0x0F Number 0x1F

Other extension types are mapped to built-in ExtBuffer object.

Custom Extension Types (Codecs)

Register a custom extension type number to serialize/deserialize your own class instances.

var msgpack = require("msgpack-lite");
 
var codec = msgpack.createCodec();
codec.addExtPacker(0x3F, MyVector, myVectorPacker);
codec.addExtUnpacker(0x3F, myVectorUnpacker);
 
var data = new MyVector(1, 2);
var encoded = msgpack.encode(data, {codec: codec});
var decoded = msgpack.decode(encoded, {codec: codec});
 
function MyVector(x, y) {
  this.x = x;
  this.y = y;
}
 
function myVectorPacker(vector) {
  var array = [vector.x, vector.y];
  return msgpack.encode(array); // return Buffer serialized 
}
 
function myVectorUnpacker(buffer) {
  var array = msgpack.decode(buffer);
  return new MyVector(array[0], array[1]); // return Object deserialized 
}

The first argument of addExtPacker and addExtUnpacker should be an integer within the range of 0 and 127 (0x0 and 0x7F). myClassPacker is a function that accepts an instance of MyClass, and should return a buffer representing that instance. myClassUnpacker is the opposite: it accepts a buffer and should return an instance of MyClass.

If you pass an array of functions to addExtPacker or addExtUnpacker, the value to be encoded/decoded will pass through each one in order. This allows you to do things like this:

codec.addExtPacker(0x00, Date, [Number, msgpack.encode]);

You can also pass the codec option to msgpack.Decoder(options), msgpack.Encoder(options), msgpack.createEncodeStream(options), and msgpack.createDecodeStream(options).

If you wish to modify the default built-in codec, you can access it at msgpack.codec.preset.

Custom Codec Options

msgpack.createCodec() function accepts some options.

It does NOT have the preset extension types defined when no options given.

var codec = msgpack.createCodec();

preset: It has the preset extension types described above.

var codec = msgpack.createCodec({preset: true});

safe: It runs a validation of the value before writing it into buffer. This is the default behavior for some old browsers which do not support ArrayBuffer object.

var codec = msgpack.createCodec({safe: true});

useraw: It uses raw formats instead of bin and str.

var codec = msgpack.createCodec({useraw: true});

int64: It decodes msgpack's int64/uint64 formats with int64-buffer object.

var codec = msgpack.createCodec({int64: true});

binarraybuffer: It ties msgpack's bin format with ArrayBuffer object, instead of Buffer object.

var codec = msgpack.createCodec({binarraybuffer: true, preset: true});

uint8array: It returns Uint8Array object when encoding, instead of Buffer object.

var codec = msgpack.createCodec({uint8array: true});

usemap: Uses the global JavaScript Map type, if available, to unpack MessagePack map elements.

var codec = msgpack.createCodec({usemap: true});

Compatibility Mode

The compatibility mode respects for msgpack's old spec. Set true to useraw.

// default mode handles both str and bin formats individually 
msgpack.encode("Aa"); // => <Buffer a2 41 61> (str format) 
msgpack.encode(new Buffer([0x41, 0x61])); // => <Buffer c4 02 41 61> (bin format) 
 
msgpack.decode(new Buffer([0xa2, 0x41, 0x61])); // => 'Aa' (String) 
msgpack.decode(new Buffer([0xc4, 0x02, 0x41, 0x61])); // => <Buffer 41 61> (Buffer) 
 
// compatibility mode handles only raw format both for String and Buffer 
var options = {codec: msgpack.createCodec({useraw: true})};
msgpack.encode("Aa", options); // => <Buffer a2 41 61> (raw format) 
msgpack.encode(new Buffer([0x41, 0x61]), options); // => <Buffer a2 41 61> (raw format) 
 
msgpack.decode(new Buffer([0xa2, 0x41, 0x61]), options); // => <Buffer 41 61> (Buffer) 
msgpack.decode(new Buffer([0xa2, 0x41, 0x61]), options).toString(); // => 'Aa' (String) 

Repository

See Also

License

The MIT License (MIT)

Copyright (c) 2015-2016 Yusuke Kawasaki

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.