Introduction to Loggalot

Loggalot is a versatile and powerful logging library designed to make logging in your applications easier and more efficient. Whether you are building a small application or a large-scale enterprise system, Loggalot offers a range of features that can cater to your logging needs.

Getting Started with Loggalot

To get started with Loggalot, you need to install the library via npm:

npm install loggalot --save

Basic Usage

The most basic use of Loggalot involves initializing a logger instance and logging messages at various levels:

  const loggalot = require('loggalot');
  const logger = loggalot.createLogger();

  // Log messages at various levels
  logger.debug('Debugging message');
  logger.info('Information message');
  logger.warn('Warning message');
  logger.error('Error message');

Configuring Log Levels

You can configure the log levels you are interested in:

  const logger = loggalot.createLogger({
    level: 'warn'
  });

  // Only 'warn' and 'error' messages will be logged
  logger.debug('This will not be logged');
  logger.info('This will not be logged');
  logger.warn('This will be logged');
  logger.error('This will be logged');

Outputting Logs to Files

Loggalot supports writing logs to files, which can be particularly useful for production environments:

  const logger = loggalot.createLogger({
    transports: [
      new loggalot.transports.File({ filename: 'application.log' })
    ]
  });

  logger.info('This message will be written to application.log');

Custom Formats

Loggalot allows you to define custom log formats:

  const { combine, timestamp, printf } = loggalot.format;

  const customFormat = combine(
    timestamp(),
    printf(({ level, message, timestamp }) => {
      return `${timestamp} [${level.toUpperCase()}]: ${message}`;
    })
  );

  const logger = loggalot.createLogger({
    format: customFormat,
    transports: [
      new loggalot.transports.Console()
    ]
  });

  logger.info('This log message has a custom format');

Logging HTTP Requests

Loggalot can be integrated with Express.js to log incoming HTTP requests:

  const express = require('express');
  const loggalot = require('loggalot');
  const app = express();
  const logger = loggalot.createLogger();

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

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

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

App Example Using Loggalot APIs

Let’s create a simple Express.js application that uses Loggalot for comprehensive logging:

  const express = require('express');
  const loggalot = require('loggalot');
  const app = express();
  const logger = loggalot.createLogger({
    transports: [
      new loggalot.transports.Console(),
      new loggalot.transports.File({ filename: 'app.log' })
    ]
  });

  // Log incoming requests
  app.use((req, res, next) => {
    logger.info(`Incoming request: ${req.method} ${req.url}`);
    next();
  });

  // Define some routes
  app.get('/', (req, res) => {
    logger.debug('Home route accessed');
    res.send('Welcome to the home page!');
  });

  app.get('/about', (req, res) => {
    logger.debug('About route accessed');
    res.send('Learn more about us on this page.');
  });

  // Handle 404 errors
  app.use((req, res) => {
    logger.warn(`404 - Not Found: ${req.originalUrl}`);
    res.status(404).send('Page not found');
  });

  // Start the server
  const PORT = process.env.PORT || 3000;
  app.listen(PORT, () => {
    logger.info(`Server running on port ${PORT}`);
  });

Conclusion

Loggalot is a powerful logging library that can greatly simplify the logging process in your applications. Its flexibility and range of features make it an excellent choice for both small projects and large-scale applications.

Try integrating Loggalot into your next project and see how it can help you manage your logs more effectively!

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