log4js-wrapper

This is a wrapper around log4js-node to simplify the simple use-case. log4js has a lot of options I don't use and I always ended up writing shortcut methods to just log with different levels.

The logging output of log4js-wrapper depends on the set environment. In development or test environments, when logging, the filename and line number of the log will be output. Very useful for debugging.

In production environment, only the alias is used. This avoids generating an Error stacktrace everytime we log something (like it does in development or test envs).

If you supply a filename as a third parameter in the constructor, logs will also be saved in that file.

This package uses many ES6 features; therefore, you must be running Node v5.0.0 or above.

Usage

Minimalist example:

const Logger = require('log4js-wrapper');
const log = new Logger('debug', 'test-logging');

log.d('This is a debug level log');
log.t('This is a trace level log');
log.i('This is an info level log');

Which will output in development env:

[2015-10-23 10:21:29.756] [DEBUG] test.js:4 - This is a debug level log
[2015-10-23 10:21:29.761] [INFO] test.js:6 - This is an info level log

And in production environment:

[2015-10-23 10:22:26.552] [DEBUG] test-logging - This is a debug level log
[2015-10-23 10:22:26.557] [INFO] test-logging - This is an info level log

API

There are six methods, which correspond to the usual log4js log levels.

Here's an example using all methods:

const Logger = require('log4js-wrapper');
const log = new Logger('trace', 'test-logging');

log.d('This ia a debug level log');
log.t('This is a trace level log');
log.i('This is an info level log');
log.w('This is a warn level log');
log.e('This is an error level log');
log.f('This is a fatal level log');
log.i('This log should not be shown since the node process whill have been terminated by the fatal log');

And here's the output in development:

[2015-10-23 10:36:27.304] [TRACE] test.js:4 - This is a trace level log
[2015-10-23 10:36:27.309] [DEBUG] test.js:5 - This ia a debug level log
[2015-10-23 10:36:27.311] [INFO] test.js:6 - This is an info level log
[2015-10-23 10:36:27.311] [WARN] test.js:7 - This is a warn level log
[2015-10-23 10:36:27.311] [ERROR] test.js:8 - This is an error level log
[2015-10-23 10:36:27.312] [FATAL] test.js:9 - This is a fatal level log

IMPORTANT!

Please note that log.f() method exits the process. Only use this in the initial loading phase of your app.