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bencode

Bencode de/encoder

Bencode

A node library for encoding and decoding bencoded data, according to the BitTorrent specification.

from Wikipedia:

Bencode (pronounced like B encode) is the encoding used by the peer-to-peer file sharing system BitTorrent for storing and transmitting loosely structured data.

It supports four different types of values:

  • byte strings
  • integers
  • lists
  • dictionaries

Bencoding is most commonly used in torrent files. These metadata files are simply bencoded dictionaries.

Install with npm

npm install bencode
package version op/sec
bencode 1.0.0 41,880
dht.js 0.2.16 36,824
dht-bencode 0.1.2 25,232
bencoding 0.0.1 19,129
bncode 0.5.3 16,567
package version op/sec
bencode 1.0.0 67,351
dht-bencode 0.1.2 64,445
bencoding 0.0.1 48,415
dht.js 0.2.16 41,648
bncode 0.5.3 3,188

Benchmarks run on an Intel Core i7-5500U @ 2.40Ghz with node v6.1.0 & GNU/Linux 4.4.0

To run the benchmarks simply use

npm run bench
var bencode = require( 'bencode' )

You can also use node-bencode with browserify to be able to use it in a lot of modern browsers.

 
var data = {
  string: 'Hello World',
  integer: 12345,
  dict: {
    key: 'This is a string within a dictionary'
  },
  list: [ 1, 2, 3, 4, 'string', 5, {} ]
}
 
var result = bencode.encode( data )
 

NOTE As of bencode@0.8.0, boolean values will be cast to integers (false -> 0, true -> 1).

d4:dictd3:key36:This is a string within a dictionarye7:integeri12345e4:listli1ei2ei3ei4e6:stringi5edee6:string11:Hello Worlde
var data   = new Buffer( 'd6:string11:Hello World7:integeri12345e4:dictd3:key36:This is a string within a dictionarye4:litli1ei2ei3ei4e6:stringi5edeee' )
var result = bencode.decode( data )
{
  string: <Buffer 48 65 6c 6c 6f 20 57 6f 72 6c 64>,
  integer: 12345,
  dict: {
    key: <Buffer 54 68 69 73 20 69 73 20 61 20 73 74 72 69 6e 67 20 77 69 74 68 69 6e 20 61 20 64 69 63 74 69 6f 6e 61 72 79>
  },
  list: [ 1, 2, 3, 4, <Buffer 73 74 72 69 6e 67>, 5, {} ]
}

Automagically convert bytestrings to strings:

var result = bencode.decode( data, 'utf8' )
{
  string: 'Hello World',
  integer: 12345,
  dict: {
    key: 'This is a string within a dictionary'
  },
  list: [ 1, 2, 3, 4, 'string', 5, {} ]
}

The API is compatible with the abstract-encoding specification.

Buffer | Array | String | Object | Number | Boolean data Buffer buffer Number offset

Returns Buffer

Buffer data Number start Number end String encoding

If encoding is set, bytestrings are automatically converted to strings.

Returns Object | Array | Buffer | String | Number

Buffer | Array | String | Object | Number | Boolean value