Introduction to Capmonster-logger

The capmonster-logger is a versatile and robust logging library that helps developers manage their application logs efficiently. This guide introduces capmonster-logger and its various APIs with practical code snippets, ensuring you can seamlessly integrate it into your project.

Getting Started

  import CapmonsterLogger from 'capmonster-logger';

  const logger = new CapmonsterLogger({
    level: 'info',
    format: 'json'
  });

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

Logging Levels

  logger.debug('This is a debug log');
  logger.warn('This is a warning log');
  logger.fatal('This is a fatal log');

Custom Log Formats

  const customLogger = new CapmonsterLogger({
    level: 'info',
    format: winston.format.combine(
      winston.format.colorize(),
      winston.format.timestamp(),
      winston.format.printf(({ timestamp, level, message }) => {
        return `${timestamp} ${level}: ${message}`;
      })
    ),
  });

  customLogger.info('This is a custom formatted info log');

Enabling File Logging

  const fileLogger = new CapmonsterLogger({
    level: 'info',
    transports: [
      new winston.transports.File({ filename: 'app.log' })
    ]
  });

  fileLogger.info('This log will be written to app.log file');

Integrating with Express

  const express = require('express');
  const app = express();

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

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

  app.listen(3000, () => {
    logger.info('App listening on port 3000');
  });

Capturing Unhandled Exceptions

  const exceptionLogger = new CapmonsterLogger({
    level: 'error',
    transports: [
      new winston.transports.Console()
    ],
    exceptionHandlers: [
      new winston.transports.File({ filename: 'exceptions.log' })
    ]
  });

  throw new Error('This is an unhandled exception');

By leveraging these powerful APIs of capmonster-logger, you can ensure comprehensive and efficient logging mechanisms in your application, enhancing debugging and monitoring capabilities.

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