Introduction to Lumberjack Logger

Lumberjack Logger is a comprehensive logging library designed to provide high-efficiency logging capabilities for various applications. It offers a plethora of APIs that cater to distinct logging needs, ensuring your projects are equipped with robust logging functionality. Let’s dive into some of the most useful APIs provided by Lumberjack Logger with code snippets and an application example.

Basic Usage

To start using Lumberjack Logger, you need to install it via npm:

  npm install lumberjack-logger

Import the Logger class and initialize it:

  const { Logger } = require('lumberjack-logger');
  const logger = new Logger();

API Methods

Logging Messages

Use the following methods to log messages:

• logger.info(message): Logs an informational message.
• logger.warn(message): Logs a warning message.
• logger.error(message): Logs an error message.
• logger.debug(message): Logs a debug message.

  logger.info('Application has started');
  logger.warn('This is a warning message');
  logger.error('An error has occurred');
  logger.debug('Debugging application');

Custom Log Levels

Create custom log levels to better classify your logs:

  logger.addLevel('custom', { color: 'blue' });
  logger.custom('This is a custom level log');

Logging Objects

Log complex objects for better debugging:

  const user = { name: 'John', age: 30 };
  logger.debug('User Data:', user);

Log Rotation

Setup log rotation to manage log file sizes:

  logger.enableLogRotation({ maxSize: '10M', maxFiles: '14d' });

Asynchronous Logging

Enable asynchronous logging for non-blocking operations:

  logger.setAsync(true);

Application Example

Here’s a basic example of an application using Lumberjack Logger:

  const http = require('http');
  const { Logger } = require('lumberjack-logger');
  const logger = new Logger();

  logger.setAsync(true);

  const server = http.createServer((req, res) => {
    logger.info(\`Request received: \${req.url}\`);
    res.end('Hello, world!');
  });

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

Conclusion

Lumberjack Logger simplifies the logging needs of any application with its versatile API and robust features. By incorporating customizable log levels, log rotation, asynchronous logging, and more, it stands out as a must-have library for effective application monitoring and debugging.

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