Introduction to Pino Pretty

Pino Pretty is a powerful, flexible, and high-performance logging library for Node.js that provides pretty-printing capabilities for the pino logger. It is designed to format and colorize the output logs to make them more readable.

Installation

  
    npm install pino-pretty
  

Basic Usage

To use Pino Pretty, you can pipe the output of pino to pino-pretty:

  
    const pino = require('pino');
    const logger = pino({
      prettyPrint: { colorize: true }
    });

    logger.info('Hello, this is an informational message');
    logger.error('This is an error message');
  

API Examples

Custom Timestamp Formatting

You can customize the timestamp format using translateTime:

  
    const logger = pino({
      prettyPrint: { translateTime: 'SYS:standard' }
    });

    logger.info('Custom timestamp formatting');
  

Level First Output

To display the log level as the first element in the log message:

  
    const logger = pino({
      prettyPrint: { levelFirst: true }
    });

    logger.warn('The log level appears first');
  

Custom Message Format

Format the log message in a custom way:

  
    const logger = pino({
      prettyPrint: {
        messageFormat: '{msg} - pid:{pid} - hostname:{hostname}'
      }
    });

    logger.info('Custom message format example');
  

Pino Pretty with Express.js

Here’s a comprehensive example of using Pino Pretty in an Express.js application:

  
    const express = require('express');
    const pino = require('pino');
    const pinoHttp = require('pino-http');

    const logger = pino({
      prettyPrint: { colorize: true, translateTime: true }
    });

    const app = express();

    app.use(pinoHttp({ logger }));

    app.get('/', (req, res) => {
      req.log.info('Hello world request');
      res.send('Hello, world!');
    });

    app.listen(3000, () => {
      logger.info('Server started on http://localhost:3000');
    });
  

With Pino Pretty and Express.js, you can ensure that your server logs are colorful, readable, and well-formatted, making debugging and monitoring a breeze.

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