Unlock the Power of mime-logger

Welcome to the complete guide on mime-logger, a powerful and flexible logging library designed to help developers improve their application’s logging capabilities. In this article, we will explore the various APIs provided by mime-logger and demonstrate their usage with practical code snippets. By the end, you will have a solid understanding of how to integrate mime-logger into your applications for enhanced logging and debugging.

Getting Started with mime-logger

First, let’s install mime-logger:

npm install mime-logger

Basic Usage

Here’s a simple example to log a message using mime-logger:

const Logger = require('mime-logger');
const logger = new Logger();

logger.log('info', 'This is an informational message');

Customizing Log Levels

With mime-logger, you can customize log levels to suit your needs:

const Logger = require('mime-logger');
const logger = new Logger({
  levels: {
    error: 0,
    warn: 1,
    info: 2,
    http: 3,
    debug: 4,
  },
  colors: {
    error: 'red',
    warn: 'yellow',
    info: 'green',
    http: 'magenta',
    debug: 'blue',
  },
});

logger.log('http', 'This is an HTTP level log');

Writing Logs to Files

mime-logger also allows you to output logs to files:

const Logger = require('mime-logger');
const logger = new Logger({
  transports: [
    new Logger.transports.Console(),
    new Logger.transports.File({ filename: 'combined.log' }),
  ],
});

logger.log('info', 'This is a log message saved to a file');

Advanced Configuration

Configuring mime-logger with advanced options:

const Logger = require('mime-logger');
const logger = new Logger({
  format: Logger.format.combine(
    Logger.format.colorize(),
    Logger.format.timestamp(),
    Logger.format.printf(({ timestamp, level, message }) => {
      return `${timestamp} ${level}: ${message}`;
    })
  ),
  transports: [
    new Logger.transports.Console(),
    new Logger.transports.File({ filename: 'error.log', level: 'error' }),
  ],
});

logger.log('error', 'This is an error message with custom format');

Example App Integration

Now, let’s integrate mime-logger into a sample Express.js application:

const express = require('express');
const Logger = require('mime-logger');

const app = express();
const logger = new Logger({
  levels: {
    error: 0,
    warn: 1,
    info: 2,
    http: 3,
    debug: 4,
  },
  transports: [new Logger.transports.Console()],
});

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

app.get('/', (req, res) => {
  res.send('Hello World!');
  logger.log('info', 'Handled Hello World route');
});

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

With this integration, your Express.js application now has enhanced logging capabilities, making it easier to debug and monitor.

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