js‑libp2p‑secio is a JavaScript implementation of the SECIO (Secure I/O) encryption protocol used by the libp2p networking stack. It provides an `encrypt` function that upgrades a plain‑text libp2p connection into a fully encrypted pull‑stream based connection, intended for developers building peer‑to‑peer applications (e.g., IPFS, decentralized services) that need secure libp2p communications in Node.js environments.