Network toolkit for Node.js — packet encode/decode (180+ protocols incl. industrial/OT), pcap/pcapng read-write, cross-packet analysis, live capture and replay.

Streaming cross-packet network analysis over the netkitty codec: TCP stream reassembly, flow tracking and Wireshark-style follow-stream, off a worker.

Shared error primitives for the netkitty packages — the NetKittyError base class every package's errors extend, plus a central error-code registry. Pure JS, zero dependencies, browser-safe.

Packet replay and traffic generation over a native addon — replays pcap/pcapng/cap at recorded inter-frame timing (or topspeed/mbps/pps) on the fastest per-platform send backend (Linux PF_PACKET, BSD/macOS BPF, Windows Npcap)

Node.js streaming read / write / parse of pcap, pcapng and .cap / tcpdump capture files — format auto-detected by magic number (classic libpcap in both endiannesses and microsecond/nanosecond variants, plus pcapng), with transparent gzip and LZ4 decompres

Live network packet capture (sniffer) over libpcap/Npcap via a native Node.js addon.

Read-only network interface enumeration for Node.js — adapters, IP/MAC addresses and tx/rx statistics (getifaddrs / networkInterfaces) via a native addon.

Browser-safe, zero-dependency pcap / pcapng / .cap / tcpdump buffer parser and pcap + pcapng generator — format auto-detected by magic number (classic libpcap in both endiannesses and microsecond/nanosecond variants, plus pcapng) — plus a pure-JS LZ4 fram

Schema-driven packet codec: encode/decode 180+ network and industrial (OT/ICS/SCADA) protocol headers — TCP/IP, TLS, HTTP/2, DNS, MQTT, plus Modbus, DNP3, IEC 61850 (GOOSE/SV/MMS), IEC 104, S7comm, OPC UA, PROFINET, EtherCAT, BACnet and more.