logformat

logformat

Stringify objects into searchable strings.

Motivation

JSON is a great format for exchanging data, but it isn't so great for logging. Say I want to log the follow user request object:

{
    date: '2015-11-19',
    client: {
        agent: 'firefox',
        ip: '10.1.32.1'
    },
    server: {
        ip: '192.168.2.222'
    }
}

If I use the traditional JSON.stringify(), I get something like this:

{"date":"2015-11-19","client":{"agent":"firefox","ip":"10.1.32.1"},"server":{"ip":"192.168.2.222"}}

That isn't very readable and hard to grep. This library solves those problems by nicely formatting objects as key=value pairs:

date=2015-11-19 client.agent=firefox client.ip=10.1.32.1 server.ip=192.168.2.222

Installation

npm install --save logformat

API

logformat(any [, opts])

Parameters:

• any anything you wish to stringify... booleans, strings, numbers, objects, arrays, etc.
• opts options for controlling the behaviour of the function. Object. Optional.
  • maxDepth maximum depth that should be formatted. positive integer. Optional.

Returns:

• formatted string

NOTE: if any is an object with a circular reference, this function returns '[Circular]';

Example

var logformat = require('logformat');
var fs = require('fs');

console.log(logformat(fs.statSync('/dev/null')));

// -> 'dev=6 mode=8630 nlink=1 uid=0 gid=0 rdev=259 blksize=4096 ino=1029 size=0 blocks=0 atime=2017-07-12T00:21:34-04:00 mtime=2017-07-12T00:21:34-04:00 ctime=2017-07-12T00:21:34-04:00 birthtime=2017-07-12T00:21:34-04:00'

Testing

There is an automated test suite:

npm test

License

See LICENSE.md