Distillation

Date: Sep 8, 2026

• 🟡 (06:58) Node.js v26.4.0 net documentation states Unix domain socket paths are filesystem pathnames limited by sizeof(sockaddr_un.sun_path), typically 107 bytes on Linux and 103 bytes on macOS.
• 🟡 (06:58) Unix domain sockets remain visible in the filesystem until unlinked. Node.js abstractions such as net.createServer() unlink sockets during server.close(), but externally created sockets and sockets left after a program crash require manual removal.
• 🟡 (06:58) Linux supports Unix abstract sockets by prefixing the path with \0, for example \0abstract; these are not visible in the filesystem and disappear automatically after all open references close.
• 🟡 (06:58) net.SocketAddress CIDR prefix values must be 0–32 for IPv4 or 0–128 for IPv6; type accepts 'ipv4' or 'ipv6' and defaults to 'ipv4'.
• 🟡 (06:58) server.listen() is asynchronous and emits 'listening' when ready; if the port is omitted or set to 0, the OS assigns an arbitrary unused port retrievable through server.address().port after 'listening'.