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