Introduction to Galactus Logger

Galactus Logger is a powerful and flexible logging library designed to help developers implement comprehensive and efficient logging in their applications. With its extensive API and customizable features, Galactus Logger ensures that important information is captured and stored for future analysis and troubleshooting.

Installing Galactus Logger

To get started with Galactus Logger, you need to install it via npm. Run the following command in your terminal:

  npm install galactus-logger

Basic Usage

Here is a simple example of how to use Galactus Logger:

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

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

Creating Custom Loggers

Galactus Logger allows you to create custom loggers with tailored settings:

  const customLogger = new Logger({
    level: 'debug',
    format: 'json',
    transports: [
      new Logger.transports.Console(),
      new Logger.transports.File({ filename: 'app.log' })
    ]
  });

  customLogger.debug('This is a debug message in JSON format');

Logging with Different Levels

Galactus Logger supports various logging levels. Here is how to use them:

  logger.trace('This is a trace message');
  logger.debug('This is a debug message');
  logger.info('This is an info message');
  logger.warn('This is a warn message');
  logger.error('This is an error message');
  logger.fatal('This is a fatal message');

Advanced Configuration

You can use advanced configuration options to fine-tune your logger:

  const advancedLogger = new Logger({
    level: 'info',
    format: 'combined',
    transports: [
      new Logger.transports.Console({ timestamp: true }),
      new Logger.transports.File({ filename: 'advanced.log', maxsize: 10000, maxFiles: 5 })
    ]
  });

  advancedLogger.info('Logger with advanced configuration');

Using Middleware for Express Apps

Galactus Logger can be integrated into Express applications as middleware:

  const express = require('express');
  const app = express();
  const loggerMiddleware = Logger.middleware();

  app.use(loggerMiddleware);

  app.get('/', (req, res) => {
    req.logger.info('Handling GET / request');
    res.send('Hello, World!');
  });

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

Logging HTTP Requests and Responses

To log HTTP requests and responses, you can use the following setup:

  app.use((req, res, next) => {
    logger.info(`Request: ${req.method} ${req.url} from ${req.ip}`);
    res.on('finish', () => {
      logger.info(`Response: ${res.statusCode} ${res.statusMessage}`);
    });
    next();
  });

  app.get('/api', (req, res) => {
    res.json({ message: 'API endpoint' });
  });

Complete Application Example

Here is a complete example of an application using Galactus Logger:

  const express = require('express');
  const Logger = require('galactus-logger');
  const logger = new Logger();
  const app = express();

  app.use(Logger.middleware());

  app.get('/', (req, res) => {
    req.logger.info('Home Page Accessed');
    res.send('Welcome to the Home Page');
  });

  app.get('/about', (req, res) => {
    req.logger.info('About Page Accessed');
    res.send('Welcome to the About Page');
  });

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

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