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Encode and parse data in the Concise Binary Object Representation (CBOR) data format (RFC7049).





Coverage Status Dependency Status Travis CI Circle CI

Assimilate all your JavaScript objects into the Concise Binary Object Representation (CBOR) data format (RFC7049) as fast as possible.


This library is a fork of the awesome node-cbor. It borrows a lot of the interface, but drops all streaming and async processing in favor of a minimal syn api and being as fast as possible.


$ npm install --save borc




const cbor = require('borc')
const assert = require('assert')

const encoded = cbor.encode(true) // returns <Buffer f5>
const decoded = cbor.decodeFirst(encoded)
// decoded is the unpacked object
assert.ok(decoded === true)

// Use integers as keys
var m = new Map()
m.set(1, 2)
encoded = cbor.encode(m) // <Buffer a1 01 02>


See for details

The sync encoding and decoding are exported as a leveldb encoding, as cbor.leveldb.

Supported types

The following types are supported for encoding:

  • boolean
  • number (including -0, NaN, and ±Infinity)
  • string
  • Array, Set (encoded as Array)
  • Object (including null), Map
  • undefined
  • Buffer
  • Date,
  • RegExp
  • url.URL
  • bignumber

Decoding supports the above types, including the following CBOR tag numbers:

| Tag | Generated Type | |-----|----------------| | 0 | Date | | 1 | Date | | 2 | bignumber | | 3 | bignumber | | 4 | bignumber | | 5 | bignumber | | 32 | url.URL | | 35 | RegExp |


Borc supports custom tags as well as custom input types.

Encode Custom Types

class MyType {
  constructor (val) {
    this.val = val

  // Gets called when encoding this object
  // gen - instance of the encoder
  // obj - the object being encoded
  // should return true on success and false otherwise
  encodeCBOR (gen) {
    return gen.pushAny('mytype:' + this.val)

cbor.encode([new MyType('hello')])

Encode Custom Tags

cbor.encode([new cbor.Tagged(42, 'hello')])

Decode Custom Tags

const decoder = new cbor.Decoder({
  tags: {
    42: (val) => val + ' world'