CodeCrafters CodeCrafters

Build your own BitTorrent

Learn about .torrent files, the BitTorrent Peer Protocol and more

Start Building
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In this challenge, you’ll build a BitTorrent client that's capable of parsing a .torrent file and downloading a file from a peer.

Along the way, we’ll learn about how torrent files are structured, HTTP trackers, BitTorrent’s Peer Protocol, pipelining and more.

Stages

Decode bencoded strings
< 5 minutes

Bencode is a binary serialization format used in BitTorrent protocol. In this stage, you’ll decode a bencoded string.

Decode bencoded integers
5-10 minutes

In this stage, you’ll decode a bencoded integer.

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