How-to: node.js Logger–winston setup / configuration


I am working on node.js based REST API development and I am using this very popular npm middleware called “Winston” for logging errors, exceptions and even info & debug log too.

Why we need it?

Now you must be wondering why we need it since we already have console.log to check logs while development, BUT what happens when we decide to go live? How to access the logs? How to create different log levels?

Well, WINSTON is your answer… following is the setup and configuration.

Manual Logging

If you want to log only specific things that you want to track, there are easy libraries that let you do so. Winston is a very popular one. You can log your output to multiple transports at the same time (e.g: file, console…). It’s also supported by 3rd parties cloud services that will be happy to host those outputs for you (more about that next). 

Here is a simple snippet of how to configure winston and log it to both your console and a file: 

 

var winston = require('winston');

//log your output to a file also

winston.add(winston.transports.File, { filename: 'somefile.log' });

//log some outputs

winston.log('info', 'Hello distributed log files!');

winston.error('Who let the dogs out?!');

How if you want dedicated log files to have all log written to it? which is idle for production anyways –  Here is my setup

– Create folder “helpers” in your project & create “logger.js” in that folder.

– logger.js code

image

– Now in your server.js or app.js (your main node startup file) add this middleware declaration

var logger = require(‘./helpers/logger.js’);

– That’s it…. You are all set…verify by logging any simple information like –

logger.info(‘this is information’);

logger.debug(‘this is debug’);

logger.warn(‘this is warning’);

logger.error(‘this is error’);

Thanks to Winston development team & of course sweet node.js…

Happy Coding Smile

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