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A bson parser for node.js and the browser

Version published
Weekly downloads
increased by2.57%
Install size
1.06 MB
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Package description

What is bson?

The bson npm package is a library that allows you to serialize and deserialize data in BSON format. BSON, short for Binary JSON, is a binary-encoded serialization of JSON-like documents. It is designed to be efficient in both storage space and scan-speed. The bson package is commonly used when working with MongoDB, as MongoDB uses BSON as its document storage format.

What are bson's main functionalities?


This feature allows you to convert a JavaScript object into a BSON formatted buffer. This is useful for storing and transmitting data in a compact binary form.

{"const BSON = require('bson'); const bson = new BSON(); const doc = { hello: 'world' }; const data = bson.serialize(doc); console.log(data); // <Buffer 16 00 00 00 02 68 65 6c 6c 6f 00 06 00 00 00 77 6f 72 6c 64 00 00>"}


This feature allows you to convert BSON data back into a JavaScript object. This is useful when you need to read data that was stored or transmitted in BSON format.

{"const BSON = require('bson'); const bson = new BSON(); const data = Buffer.from('160000000268656c6c6f0006000000776f726c640000', 'hex'); const doc = bson.deserialize(data); console.log(doc); // { hello: 'world' }"}

Other packages similar to bson



Javascript + C++ BSON parser

This BSON parser is primarily meant for usage with the mongodb node.js driver. However thanks to such wonderful tools at onejs we are able to package up a BSON parser that will work in the browser aswell. The current build is located in the browser_build/bson.js file.

A simple example on how to use it

  <script src="">
<body onload="start();">
  function start() {
    var BSON = bson().BSON;
    var Long = bson().Long;

    var doc = {long: Long.fromNumber(100)}

    // Serialize a document
    var data = BSON.serialize(doc, false, true, false);
    // De serialize it again
    var doc_2 = BSON.deserialize(data);

It's got two simple methods to use in your application.

  • BSON.serialize(object, checkKeys, asBuffer, serializeFunctions)
    • @param {Object} object the Javascript object to serialize.
    • @param {Boolean} checkKeys the serializer will check if keys are valid.
    • @param {Boolean} asBuffer return the serialized object as a Buffer object (ignore).
    • @param {Boolean} serializeFunctions serialize the javascript functions (default:false)
    • @return {TypedArray/Array} returns a TypedArray or Array depending on what your browser supports
  • BSON.deserialize(buffer, options, isArray)
    • Options
      • evalFunctions {Boolean, default:false}, evaluate functions in the BSON document scoped to the object deserialized.
      • cacheFunctions {Boolean, default:false}, cache evaluated functions for reuse.
      • cacheFunctionsCrc32 {Boolean, default:false}, use a crc32 code for caching, otherwise use the string of the function.
    • @param {TypedArray/Array} a TypedArray/Array containing the BSON data
    • @param {Object} [options] additional options used for the deserialization.
    • @param {Boolean} [isArray] ignore used for recursive parsing.
    • @return {Object} returns the deserialized Javascript Object.



Last updated on 13 Dec 2013

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