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 :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.

You can also use single letter alias's of the above - eg. log.d()

Changes

o.4.0 - Added single letter aliases

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!