Welcome to the Comprehensive Guide to caviar-logger

Logging is a crucial part of any application for both debugging and monitoring purposes. The caviar-logger is a powerful and flexible logger that makes it easier to track, store, and manage log data. In this guide, we’ll introduce caviar-logger and walk through dozens of useful API examples with code snippets to help you get started.

Getting Started with caviar-logger

To install caviar-logger, simply run:

  $ npm install caviar-logger

Basic Usage

Here is a simple example of initializing and using the caviar-logger:

  const logger = require('caviar-logger').createLogger();

  logger.info('This is an info message');
  logger.error('This is an error message');

Customization

You can customize the logger by configuring the transport and format options:

  const { createLogger, transports, format } = require('caviar-logger');

  const logger = createLogger({
    level: 'info',
    format: format.combine(
      format.colorize(),
      format.timestamp(),
      format.printf(({ timestamp, level, message }) => {
        return `${timestamp} [${level}]: ${message}`;
      })
    ),
    transports: [
      new transports.Console(),
      new transports.File({ filename: 'app.log' })
    ]
  });

  logger.info('This is an info message with custom format and transport');

Advanced Usage

Below is an example of using multiple transports and levels:

  const logger = createLogger({
    level: 'info',
    transports: [
      new transports.Console({ level: 'warn' }),
      new transports.File({ filename: 'combined.log', level: 'info' }),
      new transports.File({ filename: 'errors.log', level: 'error' })
    ]
  });

  logger.debug('This debug message will not be shown');
  logger.info('This is an info message');
  logger.warn('This is a warning message');
  logger.error('This is an error message');

Using with Express.js

Integrating caviar-logger in an Express.js application:

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

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

  app.get('/', (req, res) => {
    res.send('Hello, world!');
    logger.info('Sent response to get /');
  });

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

With these examples, you can now log various events and errors in your application efficiently using caviar-logger. This tool will help you improve debugging and monitoring processes.

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