nlogger

nlogger is a Node.js logging library that can

print messages with module name and current line number so you know from where it was called
print messages in color
print parameters in message
be configured from file

Usage

Use npm or download. Then add to your code:

var logger = require('nlogger').logger(module);

module is object defined automatically by Node.js. If you don't want automatic module names, replace it with your desired string name.

logger.info(message);
logger.info(message, parameter...);

Strings {} in message will be replaced by appropriate parameter. See examples.

Examples

var logger = require('nlogger').logger(module);
logger.info('Info message');
logger.debug('Debug message');
logger.warn('Warning message');
logger.error('Error message');
logger.trace('Trace message');
logger.info('Array = {}, Object = {}', [1, 2, 3, 4], {one: 1, two: 2});

Output samples

2010-10-02 20:39:03.570 INFO  main:5 - Info message
2010-10-02 20:39:03.588 DEBUG main:6 - Debug message
2010-10-02 20:39:03.589 WARN  main:7 - Warning message
2010-10-02 20:39:03.590 ERROR main:8 - Error message
2010-10-02 20:39:03.590 TRACE main:9 - Trace message
2010-10-02 20:39:03.590 INFO  main:10 - Array = [ 1, 2, 3, 4 ], Object = { one: 1, two: 2 }

2010-10-02 20:59:12.496 INFO  my-modules/first:3 - Message from first module from line #3
2010-10-02 20:59:12.514 INFO  my-modules/second:10 - Message from second module from line #10
2010-10-02 20:59:12.515 INFO  fake-module-name:3 - Message from third module from line #3
2010-10-02 20:59:12.516 INFO  <unknown>:3 - Message from fourth module from line #3

Configuration

nlogger can load optional configuration file nlogger.json which looks like:

{
	"color": "auto",
	"level": {
		"*": "debug",
		"my-modules/first": "info"
	}
}

color - print message in color? [true, false, "auto"]
level.* - default debug level
level.yourModuleName - debug level for specified module

Possible debug levels are trace, debug, info, warn, error.

Changes

0.3.0 - Added parameters support to logging methods

0.2.0 - Added configuration file support

0.1.0 - First npm release

License

Released under MIT License. Enjoy and Fork!