Introduction to pino-colada

pino-colada is a powerful and efficient logger for Node.js applications. It offers a rich set of APIs that help in enhancing the logging capabilities of your application. This article will walk you through the various APIs offered by pino-colada with code snippets and an example application.

Installation

 $ npm install pino-colada 

Basic Usage

 const pino = require('pino'); const pinoColada = require('pino-colada'); const logger = pino(pinoColada());
logger.info('This is an info log'); 

Advanced Usage

 const pino = require('pino'); const pinoColada = require('pino-colada'); const fs = require('fs'); const logger = pino(pinoColada(), fs.createWriteStream('./log.txt'));
logger.error('This is an error log'); 

Contextual Logging

 const pino = require('pino'); const pinoColada = require('pino-colada'); const logger = pino(pinoColada());
const childLogger = logger.child({ module: 'user-service' }); childLogger.info('User service started'); 

Integration with Express.js

 const express = require('express'); const pino = require('pino'); const pinoColada = require('pino-colada'); const expressPino = require('express-pino-logger');
const app = express(); const logger = pino(pinoColada()); app.use(expressPino({ logger }));
app.get('/', (req, res) => {
  req.log.info('Root path accessed');
  res.send('Hello, world!');
});
app.listen(3000, () => {
  logger.info('Server running on port 3000');
}); 

Adding Custom Serializers

 const pino = require('pino'); const pinoColada = require('pino-colada');
const serializers = {
  req: (req) => {
    return {
      method: req.method,
      url: req.url
    };
  }
};
const logger = pino({ serializers }, pinoColada()); logger.info({ req: { method: 'GET', url: '/test' } }, 'Request received'); 

Example Application

Let’s put it all together into a single application example.

 const express = require('express'); const pino = require('pino'); const pinoColada = require('pino-colada'); const expressPino = require('express-pino-logger');
const app = express(); const logger = pino(pinoColada());
app.use(expressPino({ logger }));
app.use((req, res, next) => {
  req.log.info('Request received');
  next();
});
app.get('/', (req, res) => {
  res.send('Hello, world!');
});
app.get('/error', (req, res) => {
  req.log.error('Error path accessed');
  res.status(500).send('Error!');
});
app.listen(3000, () => {
  logger.info('Server started on port 3000');
}); 

In this example application, we have set up pino-colada with Express.js to log various levels of messages and demonstrate how to use pino-colada in a real-world application.

By now, you should have a good understanding of how to enhance your logging setup with pino-colada. Happy coding!

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