aut

Simple logging library with filtering using environment variables

Installation

This module is installed via npm:

$ npm install aut

Filtering

By default all output is shown.

Show all name & levels except log2 & warn

LOGLEVELS=*,-warn LOGNAMES=*,-log2 node myapp

Show specific names & levels

LOGLEVELS=error,warn LOGNAMES=log2 node myapp

Colors

Colors is enabled when stdout is a TTY.

Examples

const log = require('aut')();
log('foo bar');
log('foo bar', { a: 'b' });
log.error(new Error('Shit'));
log.debug('hmm %s thats cool', 'wow');
log.warn('oh my');
log.info('aha..');

// 13 Nov 16:41:53 - foo bar
// 13 Nov 16:41:53 - foo bar { a: 'b' }
// 13 Nov 16:41:53 [error] - Error: Shit
//     at Object.<anonymous> (/Users/martin/foo/test.js:4:11)
//     at Module._compile (module.js:456:26)
//     at Object.Module._extensions..js (module.js:474:10)
//     at Module.load (module.js:356:32)
//     at Function.Module._load (module.js:312:12)
//     at Function.Module.runMain (module.js:497:10)
//     at startup (node.js:119:16)
//     at node.js:906:3
// 13 Nov 16:41:53 [debug] - hmm wow thats cool
// 13 Nov 16:41:53 [warn] - oh my
// 13 Nov 16:41:53 [info] - aha..

const log2 = require('aut')('log2');
log2('foo bar');
log2('foo bar', { a: 'b' });
log2.error(new Error('Shit'));
log2.debug('hmm %s thats cool', 'wow');
log2.warn('oh my');
log2.info('aha..');

// 13 Nov 16:41:53 log2 - foo bar
// 13 Nov 16:41:53 log2 - foo bar { a: 'b' }
// 13 Nov 16:41:53 log2 [error] - Error: Shit
//     at Object.<anonymous> (/Users/martin/foo/test.js:27:12)
//     at Module._compile (module.js:456:26)
//     at Object.Module._extensions..js (module.js:474:10)
//     at Module.load (module.js:356:32)
//     at Function.Module._load (module.js:312:12)
//     at Function.Module.runMain (module.js:497:10)
//     at startup (node.js:119:16)
//     at node.js:906:3
// 13 Nov 16:41:53 log2 [debug] - hmm wow thats cool
// 13 Nov 16:41:53 log2 [warn] - oh my
// 13 Nov 16:41:53 log2 [info] - aha..

const log3 = require('aut')('custom', {
	date: function () { return 'My Custom Date'; },
	write: function (msg) { console.log(msg); },
	levels: ['mega', 'alpha'],
	format: function (data) {
		return Object.keys(data).map(function (k) {
			return k + ': ' + data[k];
		}).join(', ');
	}
});

log3('foo bar');
log3('foo bar', { a: 'b' });
log3.mega(new Error('Shit'));
log3.alpha('hmm');

// date: My Custom Date, prefix: custom, args: [object Arguments]
// date: My Custom Date, prefix: custom, args: [object Arguments]
// date: My Custom Date, prefix: custom, args: [object Arguments], level: mega
// date: My Custom Date, prefix: custom, args: [object Arguments], level: alpha