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# socket.io-parser

[![Build Status](https://github.com/socketio/socket.io-parser/workflows/CI/badge.svg)](https://github.com/socketio/socket.io-parser/actions)
[![NPM version](https://badge.fury.io/js/socket.io-parser.svg)](http://badge.fury.io/js/socket.io-parser)

A socket.io encoder and decoder written in JavaScript complying with version `5`
of [socket.io-protocol](https://github.com/socketio/socket.io-protocol).
Used by [socket.io](https://github.com/automattic/socket.io) and
[socket.io-client](https://github.com/automattic/socket.io-client).

Compatibility table:

| Parser version | Socket.IO server version | Protocol revision |
|----------------| ------------------------ | ----------------- |
| 3.x            | 1.x / 2.x                | 4                 |
| 4.x            | 3.x                      | 5                 |


## Parser API

  socket.io-parser is the reference implementation of socket.io-protocol. Read
  the full API here:
  [socket.io-protocol](https://github.com/learnboost/socket.io-protocol).

## Example Usage

### Encoding and decoding a packet

```js
var parser = require('socket.io-parser');
var encoder = new parser.Encoder();
var packet = {
  type: parser.EVENT,
  data: 'test-packet',
  id: 13
};
encoder.encode(packet, function(encodedPackets) {
  var decoder = new parser.Decoder();
  decoder.on('decoded', function(decodedPacket) {
    // decodedPacket.type == parser.EVENT
    // decodedPacket.data == 'test-packet'
    // decodedPacket.id == 13
  });

  for (var i = 0; i < encodedPackets.length; i++) {
    decoder.add(encodedPackets[i]);
  }
});
```

### Encoding and decoding a packet with binary data

```js
var parser = require('socket.io-parser');
var encoder = new parser.Encoder();
var packet = {
  type: parser.BINARY_EVENT,
  data: {i: new Buffer(1234), j: new Blob([new ArrayBuffer(2)])},
  id: 15
};
encoder.encode(packet, function(encodedPackets) {
  var decoder = new parser.Decoder();
  decoder.on('decoded', function(decodedPacket) {
    // decodedPacket.type == parser.BINARY_EVENT
    // Buffer.isBuffer(decodedPacket.data.i) == true
    // Buffer.isBuffer(decodedPacket.data.j) == true
    // decodedPacket.id == 15
  });

  for (var i = 0; i < encodedPackets.length; i++) {
    decoder.add(encodedPackets[i]);
  }
});
```
See the test suite for more examples of how socket.io-parser is used.


## License

MIT