But, a BIGG NO to console.log. You must use something better than console.log when you are creating your node applications. In this post we will discuss about better logging in your node application by using Bunyan.
As per Bunyan, it is a simple and fast JSON logging library for nodejs services. They also have a Bunyan CLI tool for nicely viewing the logs.
How to Install Bunyan
npm install -g bunyan // It will get you Bunyan CLI in your Path
How to Use Bunyan
Create a file named example5.js whose contents will be :
var bunyan = require('bunyan');
var log = bunyan.createLogger({name: 'myFirstBunyanExample'});
log.info('1st Log using Bunyan');
log.warn('It's just a warning');
Output Without Using CLI
Output With Using CLI
Log Levels
As you can see in the output level field is a number, where for Info it is 30 and for Warning it is 40. So, let see what are the different Log Levels available
Level Name : trace, Level Number : 10
Level Name : debug, Level Number : 20
Level Name : info, Level Number : 30
Level Name : warn, Level Number : 40
Level Name : error, Level Number : 50
Level Name : fatal, Level Number : 60
Log Method API
log.info(); // returns a boolean message to know is "info" level enabled
log.info('message'); // logs a simple message
log.info('message %s', a, b); // message formatting using util.format
log.info({a: 'b'}, 'message'); //adds "a" field to log record
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