Introduction to Combined Server Logger

The combined-server-logger is a powerful tool designed to simplify and enhance server-side logging for modern applications. This logger provides a comprehensive set of APIs to facilitate effective error tracking, request logging, and performance monitoring. Below, we explore several important API examples with code snippets to help you understand and implement this logger in your application.

Basic Logging

Use the basic logging method to log general information:

  const logger = require('combined-server-logger');
  logger.info('Server started successfully');

Error Logging

Capture and log errors:

  const logger = require('combined-server-logger');
  logger.error(new Error('Something went wrong!'));

Request Logging

Log incoming HTTP requests:

  const logger = require('combined-server-logger');
  const express = require('express');
  const app = express();

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

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

Performance Monitoring

Monitor and log performance metrics:

  const logger = require('combined-server-logger');
  const startTime = process.hrtime();

  // Code to be measured...

  const [seconds, nanoseconds] = process.hrtime(startTime);
  logger.info(`Execution time: ${seconds}s ${nanoseconds / 1e6}ms`);

Custom Log Levels

Define and use custom log levels:

  const logger = require('combined-server-logger');
  logger.addLevel('fatal', 0);
  logger.fatal('A fatal error occurred');

Configuration Options

Customize logger settings:

  const logger = require('combined-server-logger');

  const config = {
    level: 'debug',
    output: 'console',
    timestamp: true
  };

  logger.configure(config);
  logger.debug('This is a debug message');

Complete Application Example

Here is a complete Express.js application example using the combined-server-logger:

  const express = require('express');
  const logger = require('combined-server-logger');

  const app = express();
  const port = 3000;

  // Middleware to log requests
  app.use((req, res, next) => {
    logger.info(`Request: ${req.method} ${req.url}`);
    next();
  });

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

  // Error handling middleware
  app.use((err, req, res, next) => {
    logger.error(err);
    res.status(500).send('Server Error!');
  });

  // Start the server
  app.listen(port, () => {
    logger.info(`Server running on http://localhost:${port}`);
  });

By integrating combined-server-logger, you can ensure better observability and debugging capabilities for your server applications.

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