@opuscapita/logger

@opuscapita/logger

This module provides simple common logging. For further details of how to use this module, please have a look at the wiki.

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Minimum setup

First got to your local code directory and run:

npm install @opuscapita/logger

After that you can directly use the logger component.

const Logger = require('@opuscapita/logger');

var logger = new Logger({});
logger.info('Hello, %s', 'world!');

By default you will get info and warning messages on stdout and error and exception messages on stderr.

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DummyLogger

In order to be able to work with a full instantiated Logger by simultaneously not logging anything (suppressing any output), you may want to use the DummyLogger provided by this module.

const Logger = require('@opuscapita/logger');

var logger = Logger.DummyLogger;
logger.info('Hello, %s', 'world!'); // Outputs nothing.

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Default configuration

The default configuration object provides hints about what the module's standard behavior is like and which configuration options are available. For further details about the API, please have a look at the wiki.

{
    defaultLogLevel : Logger.LogLevel.Info,
    minLogLevel : Logger.LogLevel.Info,
    outputStreams : {
        [Logger.LogLevel.Debug] : process.stdout,
        [Logger.LogLevel.Info] : process.stdout,
        [Logger.LogLevel.Warning] : process.stdout,
        [Logger.LogLevel.Error] : process.stderr,
        [Logger.LogLevel.Exception] : process.stderr
    },
    context : {
        serviceName : Logger.serviceName,
        serviceInstanceId : 0,
        correlationId : null,
        userId : null,
        requestUri : null
    }
}