The **js‑multibase** library implements the Multibase specification in JavaScript, providing functions to encode data with a prefix indicating the base (e.g., base58btc, base64) and to decode such prefixed strings back to raw bytes. It is aimed at developers building IPFS, libp2p, or other distributed‑system applications who need a lightweight, standards‑compliant way to handle multibase encoding/decoding in Node.js or browsers. (The package is now deprecated in favor of the newer **multiformats** module.)