Kosher-Logger: Your Ultimate Logging Solution

Welcome to the ultimate guide on Kosher-Logger, an advanced and versatile logging library for modern applications. In this article, we will explore the various features and APIs of Kosher-Logger with practical code examples to help you integrate it seamlessly into your project.

Getting Started with Kosher-Logger

First, let’s initialize the library:

  const Logger = require('kosher-logger');
  const logger = new Logger();

Logging Levels

Kosher-Logger supports multiple logging levels to categorize the importance of your logs:

• DEBUG
• INFO
• WARN
• ERROR

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

Configuring Log Outputs

You can configure the output destination of logs (console, file, custom transport):

  logger.setOutput('console'); // Default
  logger.setOutput('file', { filename: 'app.log' });
  logger.setOutput('custom', customTransportFunction);

Using Log Formats

Kosher-Logger allows you to customize log formats:

  logger.setFormat('json');
  logger.setFormat('text');

Custom formats are also supported:

  logger.setCustomFormat((level, message) => `${new Date().toISOString()} [${level.toUpperCase()}] ${message}`);

Conditional Logging

Conditional logging can be achieved by setting filters:

  logger.addFilter((level, message) => level !== 'debug');

Complete Application Example

Here is a complete example of a Node.js application using Kosher-Logger:

  const express = require('express');
  const Logger = require('kosher-logger');

  const app = express();
  const logger = new Logger();

  logger.setOutput('file', { filename: 'server.log' });

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

  app.get('/', (req, res) => {
    res.send('Hello, World!');
    logger.log('info', 'Responded to root endpoint');
  });

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

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

By following the above example, you can easily integrate Kosher-Logger into your Express applications or any other Node.js project.

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