What is Bencode?
Bencode is a compact serialization format comparable to JSON. It is used heavily in the Bittorrent ecosystem. For most use cases, it will result in a smaller encoding than JSON.
Data types
Bencode supports a few common data types; integer, byte array / string, list and dictionary.
Integer
Integers are encoded using the i prefix followed by the decimal representation of the number and the e suffix.
For example, i42e is the Bencode representation of the number 42.
Byte array / string
Byte arrays and strings are encoded using the length of the array/string followed by a colon : and then the raw data.
For example, 4:spam is the Bencode representation of the string spam.
List
Lists are encoded using the l prefix followed by the Bencode representations of the items in the list and the e suffix.
For example, li42ee is the Bencode representation of the list [42].
Dictionary
Dictionaries are encoded using the d prefix followed by the Bencode representations of the keys and values in the dictionary and the e suffix.
The keys must be byte arrays or strings and must be sorted in lexicographical order.
For example, d3:fooi42ee is the Bencode representation of the dictionary {"foo": 42}.