Introduction to Popular Logger

Logging is an essential part of any robust application. In this post, we will delve into Popular Logger, a feature-rich logging library that provides numerous APIs to enhance your application’s logging capabilities. Whether you’re a novice or an experienced developer, you’ll find these examples and snippets useful to integrate effective logging into your projects.

Installing Popular Logger

You can install the library using npm:

npm install popular-logger

Basic Usage

Here is a basic example of setting up Popular Logger:

 const { Logger } = require('popular-logger');
const logger = new Logger({
  level: 'info',
  format: 'json'
});
logger.info('This is an info message'); logger.error('This is an error message'); 

Advanced Configuration

You can customize the logger even further using advanced configurations:

 const { Logger } = require('popular-logger');
const logger = new Logger({
  level: 'debug',
  format: 'text',
  transports: [
    new FileTransport({ filename: 'logs/app.log' }),
    new ConsoleTransport()
  ]
});
logger.info('This is an info message with advanced setup'); logger.debug('Debugging information goes here'); 

Using Custom Transports

Popular Logger allows you to define and use custom transports:

 const { Logger, Transport } = require('popular-logger');
class CustomTransport extends Transport {
  log(message, level) {
    // Custom logging logic here
    console.log(`CustomTransport: ${level} - ${message}`);
  }
}
const logger = new Logger({
  transports: [new CustomTransport()]
});
logger.warn('This is a warning message using a custom transport'); 

Setting Log Rotation

Log rotation is vital for managing large log files. Here is how you can enable it:

 const { Logger, FileTransport } = require('popular-logger');
const logger = new Logger({
  transports: [
    new FileTransport({ 
      filename: 'logs/app.log', 
      maxSize: '10m', 
      maxFiles: 5 
    })
  ]
});
logger.info('Logs will be rotated automatically'); 

Performance Best Practices

To ensure logging does not impact your application’s performance, follow these best practices:

• Use appropriate log levels for different environments (e.g., ‘info’ for production, ‘debug’ for development).
• Avoid logging sensitive information unless necessary, and ensure it’s properly secured.
• Implement async logging for high throughput applications.

Putting It All Together: Sample Application

Here is a sample Node.js application integrating Popular Logger:

 const express = require('express'); const { Logger, FileTransport, ConsoleTransport } = require('popular-logger');
const app = express(); const logger = new Logger({
  level: 'info',
  transports: [
    new FileTransport({ filename: 'logs/app.log' }),
    new ConsoleTransport()
  ]
});
app.use((req, res, next) => {
  logger.info(`Incoming request: ${req.method} ${req.url}`);
  next();
});
app.get('/', (req, res) => {
  logger.info('Handling root route');
  res.send('Hello, world!');
});
app.use((err, req, res, next) => {
  logger.error(`Error encountered: ${err.message}`);
  res.status(500).send('Internal Server Error');
});
app.listen(3000, () => {
  logger.info('Server started on port 3000');
}); 

By following these guidelines, you can enhance the reliability and debuggability of your application using Popular Logger.

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