logger4node

Logger for Node

logger4node is a simple and flexible logging library for Node.js applications. It allows you to log messages with different levels of severity, and you can set different severity levels for different project files

Setup:

1. Create Application Logger.

   import { Logger4Node } from 'logger4node';
   
   const applicationLogger = new Logger4Node('Application');
   

2. Set log pattern and default log level.

   import { LogSeverity } from 'logger4node';
   
   applicationLogger.setLogLevel(LogSeverity.ERROR);
   applicationLogger.setLogPattern('Application:*');
   

3. Create file level logger.

   const fileLogger = applicationLogger.instance('File1');
   

4. Log information

   fileLogger.error('This is test log');
   

   Output:

   Error: Application:File1 This is test log
   

Configuration:

1. JSON Logs: Logging in json provide more information and is recommended for production deployments. Json logging provide time, source, request, extraData, stack.

   applicationLogger.setJsonLogging(true);
   .
   .
   .
   fileLogger.error('This is test log');
   

   Output:

   {"level":"error","time":"2024-07-01T07:07:54.877Z","className":"Application:File1","source":{"caller":"callerFunctionName","fileName":"fileName.ts","path":"file path","line":"13","column":"10"},"message":"This is test log","request":{},"extra":{},"stack":""}