log4js-node-mongodb

A log4js-node log appender to write logs into MongoDB.

log4js-node-mongodb

A log4js-node log appender to write logs into MongoDB.

You can use this appender like all other log4js-node appenders. It just needs the connection-string to the mongo db. (mongodb connection-string doku) The default collection used is log. You can log a string or any kind of object. The objects are stored as they are and not converted to strings.

var log4js = require('log4js'),
    mongoAppender = require('log4js-node-mongodb');
 
log4js.addAppender(
    mongoAppender.appender({connectionString: 'localhost:27017/logs'}),
    'cheese'
);
 
var logger = log4js.getLogger('cheese');
logger.trace('Entering cheese testing');
logger.debug('Got cheese.');
logger.info('Cheese is Gouda.');
logger.warn('Cheese is quite smelly.');
logger.error('Cheese is too ripe!');
logger.fatal('Cheese was breeding ground for listeria.');
 
// log objects 
logger.info({id: 1, name: 'wayne'});
logger.info([1, 2, 3]);

Or you can use the configure method.

var log4js = require('log4js');
 
log4js.configure({
    appenders: [
        {
            type: 'console'
        },
        {
            type: 'log4js-node-mongodb',
            connectionString: 'localhost:27017/logs',
            category: 'cheese'
        }
    ]
});

The log data is stored in the following format.

{
    _id: ObjectID,
    timestamp: loggingEvent.startTime,
    data: loggingEvent.data,
    level: loggingEvent.level,
    category: loggingEvent.logger.category
}

Here some examples.

var log4js = require('log4js'),
    mongoAppender = require('log4js-node-mongodb');
 
log4js.addAppender(
    mongoAppender.appender(
        {connectionString: 'localhost:27017/logs'}),
    'audit'
);
 
var logger = log4js.getLogger('audit');
logger.debug('Hello %s, your are the %d user logged in!', 'wayne', 10);
 
// saved as 
{
    _id: new ObjectID(),
    timestamp: new Date(),
    data: 'Hello wayne, your are the 10 user logged in!',
    level: {
        level: 10000,
        levelStr: 'DEBUG'
    },
    category: 'audit'
}
 
logger.info({id: 1, name: 'wayne'});
 
// saved as 
{
    _id: new ObjectID(),
    timestamp: new Date(),
    data: {
        id: 1,
        name: 'wayne'
    },
    level: {
        level: 20000,
        levelStr: 'INFO'
    },
    category: 'audit'
}

There are some options which can by set through the config object.

The connection-string to the mongo db.

  • | * --- | --- Type | string Required | true Default value |
var log4js = require('log4js'),
    mongoAppender = require('log4js-node-mongodb');
 
log4js.addAppender(
    mongoAppender.appender({connectionString: 'localhost:27017/logs'}),
    'cheese'
);

The name of the mongo db collection where the logs are stored.

  • | * --- | --- Type | string Required | false Default value | 'log'
var log4js = require('log4js'),
    mongoAppender = require('log4js-node-mongodb');
 
log4js.addAppender(
    mongoAppender.appender({
        connectionString: 'localhost:27017/logs',
        collectionName: 'audit'
    }),
    'cheese'
);

The write mode of the mongo db insert operation. With this option you have control over the write concern of mongo db.

  • | * --- | --- Type | string Required | false Default value | 'fast'

There are 3 options available. The default value is 'fast'.

  • | mongo options object | error logging --- | --- | --- fast | {w: 0} | no normal | {w: 1} | yes safe | {w: 1, journal: true} | yes
var log4js = require('log4js'),
    mongoAppender = require('log4js-node-mongodb');
 
// fast write mode 
log4js.addAppender(
    mongoAppender.appender({connectionString: 'localhost:27017/logs'},
    'cheese'
);
 
// normal write mode 
log4js.addAppender(
    mongoAppender.appender({
        connectionString: 'localhost:27017/logs',
        write: 'normal'
    },
    'cheese'
);
 
// safe write mode 
log4js.addAppender(
    mongoAppender.appender({
        connectionString: 'localhost:27017/logs',
        write: 'safe'
    },
    'cheese'
);

The log4js-node layout which is used when logging a string. (log4js-node layouts)

  • | * --- | --- Type | string Required | false Default value | 'messagePassThroughLayout'
var log4js = require('log4js'),
    mongoAppender = require('log4js-node-mongodb');
 
log4js.addAppender(
    mongoAppender.appender({
        connectionString: 'localhost:27017/logs',
        layout: 'colored'
    },
    'cheese'
);

In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code using grunt.

  • replace keys when logging an object to prevent mongo exception
  • $ is converted to "dollar" (only replaced at start of key)
  • . is converted to "dot" (all occurrences are replaced)
  • Safely check if the log message is a string

Litixsoft GmbH

Copyright (C) 2013-2015 Litixsoft GmbH info@litixsoft.de Licensed under the MIT license.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.