Introduction

Welcome to the comprehensive guide for lowkey-logger, a potent and versatile logging library designed for excellence in application logging and debugging. This post delves into the various functionalities offered by lowkey-logger, providing you with substantial knowledge and applications of this powerful tool.

Installing Lowkey Logger

First, let’s start with installing the lowkey-logger package:

  
    npm install lowkey-logger
  

Setting Up Lowkey Logger

Initialize the logger in your application:

  
    const lowkeyLogger = require('lowkey-logger');
    const logger = lowkeyLogger.createLogger();
  

Logging Messages

Learn how to log different levels of messages:

Info

  
    logger.info('This is an informational message');
  

Warning

  
    logger.warn('This is a warning message');
  

Error

  
    logger.error('This is an error message');
  

Conditional Logging

Log messages based on conditions:

  
    if (process.env.NODE_ENV === 'development') {
      logger.debug('This is a debug message');
    }
  

Logging with Metadata

Include additional metadata in the log messages:

  
    logger.info('User login', { userId: 12345 });
  

Exception Handling

Handle exceptions and log them:

  
    try {
      throw new Error('Something went wrong');
    } catch (error) {
      logger.error('Caught an exception', error);
    }
  

Async Logging

Support for asynchronous logging:

  
    setImmediate(() => {
      logger.info('This is an asynchronous log message');
    });
  

Configuration Options

Advanced configuration:

  
    const logger = lowkeyLogger.createLogger({
      level: 'debug',
      format: lowkeyLogger.format.simple(),
      transports: [
        new lowkeyLogger.transports.Console(),
        new lowkeyLogger.transports.File({ filename: 'application.log' })
      ]
    });
  

Real World Application Example

Here is a basic example of an application using lowkey-logger:

  
    const express = require('express');
    const lowkeyLogger = require('lowkey-logger');
    const logger = lowkeyLogger.createLogger();

    const app = express();

    app.use((req, res, next) => {
      logger.info(`Received request for ${req.url}`);
      next();
    });

    app.get('/', (req, res) => {
      res.send('Hello, World!');
    });

    app.listen(3000, () => {
      logger.info('Server is running on port 3000');
    });
  

With these detailed implementations and examples, you should now be well-equipped to utilize lowkey-logger in your applications, improving your debugging and monitoring practices effectively.

Hash: 78578d470048a625b22b954cdb974890ee996c70a5ca461b62170425c284d6cb