NMSG and JSON encoding

**Executive Summary:** This article introduces 'njt', an open-source Python command-line utility from Farsight Security that provides a simple interface to serialize newline-delimited JSON into NMSG base:encode protocol data units and to deserialize JSON-encoded NMSG PDUs back to JSON; the document explains installation, command-line options, record delineation, and example use cases including file encoding/decoding, live SIE channel decoding, and streaming DNSDB query results.