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# socket.io-parser
[](http://travis-ci.org/socketio/socket.io-parser)
[](http://badge.fury.io/js/socket.io-parser)
A socket.io encoder and decoder written in JavaScript complying with version `3`
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).
## 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_EVENTEVENT
// 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