golog

GoLog

A light-weight stdout logging library for NodeJS and Deno. Checkout the main features:

• JSON output by default
• Automatic readable output format for dev environments
• Auto-format error, request and repsonse objects.
• Support for adding custom function to parse interesting input data
• printf-like formatting on messages.
• Automatic pid field on log entries.
• Log entries filtering by level or type (whitelist, blacklist)

Get Started NodeJS

1. Install with: npm i -P golog.
2. Setup a logger:

const GoLog = require('require');

// Crate a new logger.
var log = new GoLog();

Get Started Deno

import GoLog from 'https://deno.land/x/golog@v0.4.0-0/deno/main.js';

// Crate a new logger.
var log = new GoLog();

1. Create new log entries with one of the supported levels:

log.debug('Main log message');
log.info('Main log message');
log.warn('Counting, %d, %d, %d... %s', 1, 2, 3, 'Foo!');
log.error('Main log message');
log.fatal({ merge: 'this', object: 'with', the: 'entry' }, 'The MSG');

Other Features

You can set default properties to show up in every log entry for a given logge rinstance. For exemple we can use it to set a source.

var l1 = new GoLog({ defaults: { source: 'app-a' } });
l1.warn('Hey!');
var l2 = new GoLog({ defaults: { source: 'app-b' } });
l2.warn('Ho!');

Default loggers log entries of any level. Change the level for warn or higher.

var log = new GoLog({ level: 'warn' });
log.debug('Let\'s go!');

You can check/use log entries right off the bat.

var log = new GoLog();

let e1 = log.fatal('foo');
let e2 = log.debug('bar');
console.log(e1, e2);

If you want to log some information about an Error instance, just add it as a key to the data object.

log.warn({ err: new Error('My error') }, 'The message lives on');

GoLog also formats http request objects.

const http = require('http');
const GoLog = require('require');

var log = new GoLog();

var server = http.createServer(function(req, res){
    res.end();
    log.warn({ req }, 'The message lives on');
}).listen(8765);

http.get('http://localhost:8765');

You can create a disabled logger if you send false as the input parameter

var log = new GoLog(false);
log.info('Wont log this');

Reporting Bugs

If you have found any problems with this module, please:

1. Open an issue.
2. Describe what happened and how.
3. Also in the issue text, reference the label ~bug.

We will make sure to take a look when time allows us.

Proposing Features

If you wish to get that awesome feature or have some advice for us, please:

1. Open an issue.
2. Describe your ideas.
3. Also in the issue text, reference the label ~proposal.

Contributing

If you have spotted any enhancements to be made and is willing to get your hands dirty about it, fork us and submit your merge request so we can collaborate effectively.

Changelog

[v0.5.1] - 2023-04-25

Fixed

• automatic err parser to not break on Error subclasses that have no stack member

Removed

• automatic pid and hostname keys from log entries