Welcome to Karma Logger

Karma Logger is a robust, flexible logging library for JavaScript applications. It offers extensive API capabilities that help developers manage and debug their applications more efficiently. In this guide, we will explore dozens of useful APIs provided by Karma Logger, along with code snippets and an example application. Let’s get started!

Installation

  
    npm install karma-logger --save
  

Getting Started

  
    const logger = require('karma-logger');

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

API Reference

Basic Logging

  
    logger.info('Information level log');
    logger.debug('Debugging details log');
    logger.warn('Warning level log');
    logger.error('Error level log');
    logger.fatal('Fatal error log');
  

Setting Log Levels

  
    logger.setLevel('info'); // Available levels: 'debug', 'info', 'warn', 'error', 'fatal'

    logger.debug('This will not be logged'); // Since the level is set to 'info'
    logger.info('This will be logged');
  

Adding Custom Loggers

  
    const customLogger = logger.createLogger('custom');

    customLogger.info('Custom logger information');
    customLogger.error('Custom logger error');
  

Logging with Additional Metadata

  
    logger.info('User logged in', { userId: '12345', role: 'admin' });
    logger.error('Payment failed', { orderId: '67890', amount: 150 });
  

Handling Exceptions

  
    try {
      // Code that may throw exception
    } catch (error) {
      logger.error('An error occurred', { error });
    }
  

Application Example

  
    const express = require('express');
    const logger = require('karma-logger');

    const app = express();

    logger.setLevel('info');

    app.use((req, res, next) => {
      logger.info('Request received', { method: req.method, url: req.url });
      next();
    });

    app.get('/', (req, res) => {
      res.send('Hello World!');
      logger.info('Response sent', { statusCode: 200 });
    });

    app.use((err, req, res, next) => {
      logger.error('Server Error', { message: err.message });
      res.status(500).send('Server Error');
    });

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

These examples represent just a few of the many ways you can use Karma Logger to enhance your application’s logging and debugging capabilities. Explore the library further to find even more useful features!

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