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I was looking at top Node logging systems: npmlog, log4js, bunyan and winston and decided to use winston for having the most npm monthly downloads.
What I want to set up is custom logger which I will be able to use on development environment with logger.debug(...) which won't log anything on production environment. This will help me so when I'm on development environment, I won't need to write anything since I'll see all the outputs.
This is what I have now:
var level = 'debug'; if (process.env.NODE_ENV !== 'development'){ level = 'production'; // this will never be logged! } var logger = new winston.Logger({ transports: [ // some other loggings new winston.transports.Console({ name: 'debug-console', level: level, prettyPrint: true, handleExceptions: true, json: false, colorize: true }) ], exitOnError: false // don't crush no error }); Problem occurs when I'm trying to log JavaScript Object or Javascript Array. With Object, I need to do toJSON(), and for Array I need first JSON.stringify() and then JSON.parse().
It's not nice to write all the time this methods, just to log something that I want. Furthermore, it's not even resource-friendly, because those formatting methods need to be executed before logger.debug() realises that it's on production and that it shouldn't log it in the first place (basically, it's evaluating arguments before function call). I just like how old-fashined console.log() logs JavaScript objects and arrays.
Now, as I'm writing this question, I found that there is a way of describing custom format for every winston transports object. Is that the way of doing it, or is there some other way?
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Winston should log your object with this set up. Show activity on this post. Show activity on this post. const winston = require("winston"); const { format, transports, createLogger } = winston; const path = require("path"); const consoleloggerLevel = process.
Answer: Use console. log() or JSON. stringify() Method You can use the console. log() method, if you simply wants to know what's inside an object for debugging purpose. This method will print the object in browser console.
js provides a console module which provides tons of very useful ways to interact with the command line. It is basically the same as the console object you find in the browser. The most basic and most used method is console. log() , which prints the string you pass to it to the console.
Go to the example. log file in the logs folder to view the log. Winston allows you to implement multiple logging transports, i.e., a log can be recorded to a file, console, or database. The Logger configuration below logs to a console and a file.
logger.log("info", "Starting up with config %j", config); Winstons uses the built-in utils.format library. https://nodejs.org/dist/latest/docs/api/util.html#util_util_format_format_args
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try changing prettyPrint parameter to
prettyPrint: function ( object ){ return JSON.stringify(object); } If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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