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Bencode エンコーダー / デコーダー

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入力

自動処理

出力

クライアント側

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ガイド

Bencode エンコーダー / デコーダー

Encode JSON to Bencode format or decode Bencode back to JSON instantly. Bencode is the serialisation format used by BitTorrent for .torrent files and the DHT protocol. Paste Bencode input to decode it into readable JSON, or paste JSON to encode it into compact Bencode — all client-side with no data transmitted.

使い方

Select your direction (Bencode → JSON or JSON → Bencode), paste your input, and the result appears instantly. Use the built-in example to see a real .torrent file structure decoded into JSON.

特徴

双方向変換 – Bencode to JSON and JSON to Bencode
Full type support – integers, byte strings, lists, and dictionaries
例のプリセット – real .torrent file structure for reference
Real-time output – converts as you type
クライアントサイドのみ – データはブラウザから離れることはありません

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 よくある質問

What is Bencode and why does BitTorrent use it?

Bencode is a simple serialisation format designed for BitTorrent by Bram Cohen. It encodes four types: byte strings (4:spam), integers (i42e), lists (l...e), and dictionaries (d...e). BitTorrent uses it for .torrent metainfo files and DHT messages because it is unambiguous (no encoding ambiguity like JSON has for numbers), compact, and trivial to parse in any language without a library.
How does Bencode encode different data types?

Bencode encodes integers as ie (e.g., i42e), byte strings as : (e.g., 4:spam), lists as le, and dictionaries as de where keys must be byte strings in sorted order. Nesting is supported arbitrarily. There is no native boolean or float type — booleans are represented as integers (0/1) and floats are typically stored as strings.
What information is inside a .torrent file?

A .torrent file is a Bencoded dictionary containing: the announce URL of the tracker, an info dictionary with the torrent name, piece length, SHA-1 hashes of all pieces, and either a single file length or a list of files with paths and lengths. Optional fields include announce-list (backup trackers), creation date, comment, and created-by. Magnet links encode a subset of this as a URI.
Can Bencode handle binary data?

Yes. Bencode byte strings are raw binary sequences prefixed with their byte length. This is why .torrent files store SHA-1 piece hashes as raw 20-byte binary strings rather than hex. When converting Bencode to JSON, binary strings are typically represented as hex or Base64 since JSON has no native binary type.