Sign Up for Free

RunKit +

Try any Node.js package right in your browser

This is a playground to test code. It runs a full Node.js environment and already has all of npm’s 1,000,000+ packages pre-installed, including bser with all npm packages installed. Try it out:

var bser = require("bser")

This service is provided by RunKit and is not affiliated with npm, Inc or the package authors.

bser v2.1.1

JavaScript implementation of the BSER Binary Serialization

BSER Binary Serialization

BSER is a binary serialization scheme that can be used as an alternative to JSON. BSER uses a framed encoding that makes it simpler to use to stream a sequence of encoded values.

It is intended to be used for local-IPC only and strings are represented as binary with no specific encoding; this matches the convention employed by most operating system filename storage.

For more details about the serialization scheme see Watchman's docs.


var bser = require('bser');


The is the synchronous decoder; given an input string or buffer, decodes a single value and returns it. Throws an error if the input is invalid.

var obj = bser.loadFromBuffer(buf);


Synchronously encodes a value as BSER.

var encoded = bser.dumpToBuffer(['hello']);
console.log(bser.loadFromBuffer(encoded)); // ['hello']


The asynchronous decoder API is implemented in the BunserBuf object. You may incrementally append data to this object and it will emit the decoded values via its value event.

var bunser = new bser.BunserBuf();

bunser.on('value', function(obj) {

Then in your socket data event:



Read BSER from socket:

var bunser = new bser.BunserBuf();

bunser.on('value', function(obj) {
  console.log('data from socket', obj);

var socket = net.connect('/socket');

socket.on('data', function(buf) {

Write BSER to socket:

RunKit is a free, in-browser JavaScript dev environment for prototyping Node.js code, with every npm package installed. Sign up to share your code.
Sign Up for Free