That message parameter is either an object or a string (someone correct me if I'm wrong but that's my understanding).. Firstly, we added a transports array in our Winston options object, which from now on will contain all transports that will be used by Winston. I am going to use the framework fortjs with es6 syntax, but you can use any framework. Logging to NodeJS Console Using a Library: Winston, Node-Bunyan, & Tracer. Winston adds the Console transport by default. 1. Winston provides a simple method to log exceptions. Winston formats explained Install the Winston node package with the Node package manager The console module is usually the first tool Node.js developers reach for when handling logging in an application. Remove it: winston.remove(winston.transports.Console); Or instantiate your own logger: var logger = new (winston.Logger)({ transports: [ new (winston.transports.File)({ filename: 'somefile.log' }) ] }); And use your new logger: logger.log('info', There are no compile errors or other issues. But then you might stumble upon a logging framework like Winston or Bunyan. Unfortunately, developers have different assumptions about what logging is used for, and some simply do not realize its importance. This doesn't work because, unlike console.log(), the winston's logger.(message) takes only one parameter called message. stream: Output stream for writing log lines. I know, I know… too much info here. It's easy to use, native to the platform, and easy to read. Winston is a famous nodejs library for logging. I am confused by winston. Logging Exceptions. So let’s break it down. We added a Console transport in the array, so Winston can log to the terminal. Depending on the process context, the asynchronous nature of logging can lead to lost log messages if not handled properly. We also set the following formats. By default, it outputs to the console, so let’s define a stream function into Winston so that we can transfer morgan’s output into the Winston log files. What matters is doing it consistently across the lifetime of the application. At the end of this read, you will be able to create a custom logger using the Winston npm library and add transports where logs will … That’s where logging libraries for NodeJS become quite useful. If you don't want log to the console you have two options. It allows a custom message to be added for simple log analysis and debugging. It provides so many customisation and is easy to use. Writing diagnostic information to the console or a log file isn’t difficult. The basic power of those tools might be attractive enough for you to consider switching. Step 1. winston.error("Call to undefined method stringToFloat"); Alternatively, you can use the following syntax: winston.log("error", "Call to … To overcome all these issues we will use Winston logging framework, there are few other options are also available like Bunyan, Pino, etc. We also need different kinds of configuration like standard format, JSON output format to send to ELK stack, and these are not available in console out of the box. We will start from simple console logs, moving to more advanced features, one step at a time. '); the console remains empty. Winston Library Defaults to process.stdout; Let’s look at an example of Morgan with Winston logger into an express based Node.js application. In this tutorial, we will discuss how to correctly perform logging on NodeJS. Logs can be displayed on the console and written to a file while working with Node.js.Here in this tutorial, we will learn how to create create a logger which keeps track of Request, Response, Errors and Time while building an ExpressJS application in Javascript/Typescript . Why we need a logging library like Winston? I am using the following typescript code to log onto the console in my *.ts file: import { Logger, LoggerInstance } from "winston"; const logger:LoggerInstance = new Logger();'Now my debug messages are written to the console!

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