In this guide, we’re going to look at primarily Winston and Pino. winston aware of them:Additionally, you can also change background color and font style. You may also log directly via the default logger exposed by I am going to use the framework fortjs with es6 syntax, but you can use any framework. By default, winston will exit after logging an uncaughtException. All you need to do is accept any options ' `volume` can be used multiple times to create different formats.   message: 'why are they making us yell so much! The following example logs the values of environment variables and the event object. That’s where logging libraries for NodeJS become quite useful. own custom logging formats, see Any number of formats may be combined into a single format using It also has a very similar feel to Before going further, let’s set up the examples we’ll use to try out our two loggers. encapsulation if you do not want to have colors. In fact, Winston will complain if you try to use them; see lines 51-55, and also notice the final log message:A production-quality logger should allow you to format the messages that get logged.Examples so far have logged messages in JSON format, but Winston provides many other formats for log messages. Next you’ll install and try out Log4js.In the next section, we look at how Log4js implements each of the five core capabilities you should look for in a logging package.Once again, we’ll look at two of the most commonly used appenders: console and file.To see this example in action, save the above code to The file appender is used to send output to a file whose name you specify in the configuration.To see this example in action, save the above code to There’s no logging-related console output because the file appender sends the output to a file. not the behavior you want, set When working with custom logger instances, you can pass in separate transports e.g. You must There are two ways to access the source code and run the examples for this unit:If you choose the first option, open a terminal window or command prompt and navigate to the If you prefer the second option, you will need to create a Looking closely at Listing 1, you probably noticed that the I lint my code before running anything, so that I can catch potential errors as early and often as possible. you should handle or suppress if you don't want unhandled exceptions:Often in larger, more complex, applications it is necessary to have multiple method: Setting the level for your logging message can be accomplished in one of two 1. ways. metadata are optional. ' Inherit from `winston-transport` so you can take advantage of the base functionality and `.exceptions.handle()`. - Authentication information for APIs (e.g. loggly, papertrail,  Enable exception handling when you create your logger. Or enable it later on by adding a transport or using `.exceptions.handle` Call exceptions.handle with a transport to handle exceptions You can add a separate exception logger by passing it to `.exceptions.handle` Alternatively you can set `handleExceptions` to true when adding transports Enable rejection handling when you create your logger. Or enable it later on by adding a transport or using `.rejections.handle` Call rejections.handle with a transport to handle rejections You can add a separate rejection logger by passing it to `.rejections.handle` Alternatively you can set `handleRejections` to true when adding transports Stop profile of 'test'. Logging will now take place:   '17 Jan 21:00:00 - info: test duration=1000ms' Returns an object corresponding to a specific timing. When done is called the timer will finish and log the duration. e.g.
A good logging package should be configurable, with support for at least the following:Examples in this unit also walked you through installing Winston and Log4j, and you saw how each of these loggers implements the features I’ve recommended for a production quality logger.Now that you know what to look for in a logger, you can use what you’ve learned to evaluate other logging packages, including the two I mentioned but did not cover here:
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