sdebug

A wrapper around debug() to add structured data logging, viz., RFC5424.

First, take a look at the excellent debug module to understand the basic concepts.

Next, to add structure:

% DEBUG='*' node

    // create a new debugging instance with the 'server' prefix
    var debug = new (require('sdebug'))('server')

    // add default properties for every log entry
    debug.initialize({ 'server': { id: server.info.id } })

    // create a log entry with unstructured text
    debug('hello world.')

    // outputs:
    server [server@1104 id="zekariah.local:58165:iksjwi0d"] hello world

    // create a log entry with structured data
    var params = { request: { id: '...', method: '...', pathname: '...', statusCode='...' },
                   headers: ... }
    debug('end', params)

    // outputs (newlines added for readability):
    server [request@1104 id="1455817135688:zekariah.local:58165:iksjwi0d:10000" method="GET" pathname="/" statusCode="200"]
           [headers@1104 content_type="text/html; charset=utf-8" cache_control="no-cache" vary="accept-encoding" content_encoding="gzip"]
           end