Lou Bichard December 31, 2018 Developer Tips, Tricks & Resources. Morgan is especially good at logging for http requests. logger ({... }) // this allows winston to handle output from express' morgan middleware: logger. By standard, the express-generator boilerplate makes use of the adjustable logger whenever referencing the morgan package. Setup is very simple, as it uses Winston underneath. var logger = new winston. What format should you log? Supporting each other to make an impact. However, custom format should be avoided where possible. use (express. What does createLogger do? You get paid; we donate to tech nonprofits. Before you begin this guide you’ll need the following: 1. So to help those who need a concrete example, let’s introduce one. I know things like design patterns can seem abstract. I still had so many questions. The application is already set up to respond to such an error, thanks to the boilerplate created by express-generator. use (express. We’ll dive into the ins and outs of why to use logging and how and what to log in a practical way. Built with JavaScript. On the other hand, Winston is good at splitting logs with different levels. Get the latest tutorials on SysAdmin and open source topics. How much do you log? To view the contents of the log file, run the following command: You should see something similar to the following: So far our logger is only recording HTTP requests and related data. It replaces the default NestJS logger with winston, and optionally also adds express logs using express-winston. If you reload the page in the web browser, your should see something similar to the following in the console of SSH Session A: There are two log entries here - the first for the request to the HTML page, the second for the accompanied stylesheet. npm install express-logger-unique-req-id –save. You get paid, we donate to tech non-profits. I couldn’t leave you hanging like that, as I know you’ll have other questions, like, “Why JSON?” “What are the best practices for logging?” “How do I structure my log code using Winston?”. Winston can transport logs to an external location or query them when analyzing a problem. We are creating winston logger for handle logs and log format. Winston’s features include support for multiple storage options and log levels, log queries, and even a built-in profiler. With these prerequisites in place, we can build our application and install Winston. How should we log? For example log errors and info messages into different files. That’s just a few reasons you’d want to use Winston over the humble console.log. It can give you more contextual insights to help you troubleshoot issues. Open the file for editing by running: Import winston near the top of the file with the other require statements: The first place we’ll actually use winston is with morgan. Let’s look at an example of Morgan with Winston logger into an express based Node.js application. Express and Cors npm i express cors @types/express; Winston Logger for Logging npm i winston @types/winston; module-alias for Module Aliases npm i module-alias; The package.json file looks something like this – The problem was when I turned to the internet for answers, I could only find tutorials that would show me how to log to a file. For Winston, the first question you might have is, “What’s wrong with console.log?”, Nothing is wrong with console.log, per se. Preferably, a tool that can integrate errors and logs so you have all the context you need. Tired of ssh'ing into your server to debug it?Instead of cosole.log and console.err, you should be using a logger like winston to send your logs somewhere more convenient. For some reason, the log output is written both to console and the designated log file. Open a browser window and enter these URLs to illustrate your log outlet. While we are at it, let’s change the log format used by the morgan package to combined, which is the standard Apache log format and will include useful information in the logs such as remote IP address and the user-agent HTTP request header. The real value of structured logs is when you run it through a centralized logging platform like Retrace. The open-source Winston logger helps take a load off our shoulders by making it easier to centralize, format, enrich, and distribute the logs to fit a particular need. Time stamp each log line. A simple configuration change is all that is needed. We recommend that you take the time to look at some of these other documents: Sign up for Infrastructure as a Newsletter. Today we’re talking about logging within the context of Winston. Before you begin this guide you’ll need the following: One Ubuntu 16.04 server set up by following the Ubuntu 16.04 initial server setup guide, including a sudo non-root user and a firewall. A great use case for logging would be if, for example, you have a bug in your system and you want to understand the steps that led up to its occurrence. Install npm i express-pino-logger --save Example ' Check our free transaction tracing tool, Tip: Find application errors and performance problems instantly with Stackify Retrace. Next, we need to ask another question: how should you structure your log code? You will also have Winston implemented to log errors and messages to a file and the console. mkdir ./logs ./config Create a file for our Winston logger configuration. This will create our application with everything we need to get started: Next, install Nodemon, which will automatically reload the application whenever we make any changes. We will use the new SSH session for running commands and editing files, and we’ll refer to this session as Session B. — philosophical Node.js developer (contrived). npm i nconf. For logging, this can make life a lot easier. Let’s start by creating a simple Express.js app. nest-express-winston. Some of these requirements are pretty trivial, others are not so much. We will use the nconf module for configuring:. var express = require ('express'); var expressWinston = require ('express-winston'); var winston = require ('winston'); // for transports.Console var app = module. Create file in src/lib/logger.js and write the following code Join us for a 15 minute, group Retrace session, How to Troubleshoot IIS Worker Process (w3wp) High CPU Usage, How to Monitor IIS Performance: From the Basics to Advanced IIS Performance Monitoring, SQL Performance Tuning: 7 Practical Tips for Developers, Looking for New Relic Alternatives & Competitors? After completing this tutorial you will have an Ubuntu server running a small Node/Express application. Request endpoint data, such as paths: “/users” or verbs: Enrich log entries with plenty of useful data. 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. You can isolate the logs you are looking for by specifying the environment, server, or application. First, let’s install dependencies: $ yarn add morgan @types/morgan morgan-body. To help us get a basic web application running we will use express-generator, a command-line tool for getting a Node/Express web application running quickly. Installation npm install winston express-winston ... For example, using the following during logger setup: expressWinston.responseWhitelist.push('body.import.value'); A response that looks like this : exports = express (); app. Learn Why Developers Pick Retrace, 5 Awesome Retrace Logging & Error Tracking Features, some advanced features for formatting log code, Flamegraph: How to Visualize Stack Traces and Performance, Docker Performance Improvement: Tips and Tricks, Winston Logger Ultimate Tutorial: Best Practices, Resources, and Tips, Top API Performance Metrics Every Development Team Should Use, Site Performance Monitoring Best Practices. Remember, logs are data still, so they’re still governed by the same rules and laws as any other data. Morgan can operate standalone, but commonly it’s used in combination with Winston. Logs are a simple way of persisting data about your application so you can view this data for analysis later. Where do you put logs? It can be confusing to call either one of them logger since we will be using morgan and winston , which are both logging packages,. When do you log? Below are techniques in Node.js to help keep your log structures consistent. This is what we want: structured log data. Database Deep Dive | December 2nd at 10am CST, Traces: Retrace’s Troubleshooting Roadmap | December 9th at 10am CST, Centralized Logging 101 | December 16th at 10am CST. We are now ready to install and configure Winston. I should note that while you should log as much as you can, there’s an exception. You don’t want to log any sensitive data, such as passwords, secret keys, or personal data. Are you looking to get up and running with Winston logger in Node.js? So let’s introduce it and look at the syntax. We know you’re busy, especially during the holiday season. This is great as it allows you to do things like visualizing based on properties (and even nested properties). express-winston. Let’s quickly set up a basic logging example using Winston. Introduce how to combine Morgan and Winston for logging in express server. Open it up and run this command in your terminal: npm init -y npm i express winston morgan morgan-json Hub for Good exports = express (); app. Ill go over an simple NodeJS application using Winston 'globally' using two of its 13 transports (coming from log4j Java Background I associate transports with log4j Appenders). Why do I mention the facade pattern? To get our logger working with the application we need to make express aware of it. The answer to what you should log has a short answer and a long answer. And why is the output formatted like that? Hopefully, that was a useful introduction to Winston and some best practices in Node.js for how to structure your code to keep it clean and consistent with the facade pattern and logging namespaces. Hey all! We will also dive into features that make Winston a good fit for … 2. So be careful what you’re logging. As you can see, Winston is using JSON by default. Nodemon will automatically watch for changes and restart the application for us. We can define the configuration settings for the file and console transports in the winston configuration as follows: Next, instantiate a new winston logger with file and console transports using the properties defined in the options variable: By default, morgan outputs to the console only, so let’s define a stream function that will be able to get morgan-generated output into the winston log files. To illustrate how we can do this, let’s call the logger from the error handler route. In this guide we’ll focus on a logging package called Winston, an extremely versatile logging library and the most popular logging solution available for Node.js applications, based on NPM download statistics. Node.js installed using the official PPA, as explained in How To Install Node.js on Ubuntu 16.04.With these prerequisites in place, we can build our application and install Winston. Don’t worry, it’s not too much. Because we installed the Node Package Manager as part of our prerequisites, we will be able to use the npm command to install express-generator. Unless otherwise noted, all remaining commands should be run in Session B. Since all server-side errors will be run through this route, this is a good place to include the winston logger. For our example, let’s try morgan, morganBody, and a custom one. Log levels are specified when calling the logger, meaning we can do the following to record an error: logger.error('test error message'). Again, both transports are configured to log error level messages so we should see the output in the console and file logs. Since each transport is configured to handle info level log data, we should also see similar information in the file transport located at ~/myApp/logs/app.log. JSON is the default standard for logging in Node.js and is a great option with Winston. Hacktoberfest Exit and save the file by typing CTRL-X, then Y, and then ENTER. We'd like to help. Since we will be using morgan and winston, which are both logging packages, it can be confusing to call either one of them logger. In what format, and why? Node Express.js and Morgan logging Express.js Express.js is one of the most popular frameworks for creating web applications with Node.js. Retrace Overview | January 6th at 10am CST. Set Up an Express.js Application. 1. If a log is logged, but no alert is triggered or it’s visualized, was it logged at all? We will use the stream option, and set it to the stream interface we created as part of the winston configuration. For the rest of this article, we’ll refer to the SSH session we’ve been using so far and that is currently running the application as Session A. We’ll also look at how we can combine Winston with another popular HTTP request middleware logger for Node.js called Morgan to consolidate HTTP request data logs with other information. Here, I'll show you how to send them to AWS CloudWatch for easy access and monitoring. With express-pino-logger you can have features, safety and speed. And since we want to be able to use nodemon as a command-line tool we will install it with the -g flag: To finish setting up the application, change to the application directory and install dependencies as follows: By default, applications created with express-generator run on port 3000, so we need to make sure that port is not blocked by the firewall. We will also use the -g flag, which installs the package globally so it can used as a command line tool outside of an existing Node project/module. The express-generator package includes a 404 and 500 error handler route by default, so we’ll work with that. This package is not directly related to Winston, but helps immensely when specifying paths to files in Node.js code. Logging format should be easily digestible by humans as well as machines. Codota search - find any JavaScript module, class or function Then create the following logging code and save it into a file (of any name). Retrace allows you to view all logging messages in an inline view across all apps, servers, and in all environments. The fact that express-pino-logger achieves higher throughput with JSON logging and arbitrary data, without using eval, serves to emphasise the high-speed capabilities of express-pino-logger. Now that our app is set up we are ready to start working with Winston. That means we can use this object and the logging levels, for instance, to create our example log output. use (express. And after that, we’ll round off with some best practices for structuring your Node.js application so you can write easy, elegant, and clean logging code, using the Express framework. We can include anything we want in the log so be sure to include some useful information like: Update the error handler route to match the following: To test this, let’s try to access a page in our project that doesn’t exist, which will throw a 404 error. He is my code: Working on improving health and education, reducing inequality, and spurring economic growth? Winston uses npm logging levels that are prioritized from 0 to 5 (highest to lowest): When specifying a logging level for a particular transport, anything at that level or higher will be logged. Okay, I’ve told you to log lots of rich data—the kind that tells you a lot about your application—which leads us nicely onto the next part. We can test that it’s working by going to http://your_server_ip:3000 in a web browser. ... Morgan works with frameworks that are compatible with modules such as Express.js. const winston = require('winston'); The first, most important question is, “Why bother logging at all?”. Today, we will explore Winston, a versatile logging library for Node.js. This allows you to log your application code in a way that’s consistent across your application. Let’s look at the createLogger method first. Middleware intercepts requests for purposes such as authentication—or in our case, logging! The createLogger method is one that takes a config object and returns a logger object with several methods bound to it which are your logging levels (more on this later). Back in your web browser, attempt to load the following URL: http://your_server_ip:3000/foo. methodOverride ()); // Let's make our express `Router` first. Mainly because its easy to setup, has all the appenders needed, and can be used in any module you require it in. As you can see, the above code is wrapping your regular Express handler with additional functionality. We’ll do this in four files, to keep things nice and tidy. If that’s what you’re looking for, you’re in the right place! Well, you’re in luck—these questions are exactly what we will answer today. In this tutorial, you built a simple Node.js web application and integrated a Winston logging solution that will function as an effective tool to provide insight into the performance of the application. To do so, run the following command: This starts the application running on port 3000. Application showing an unidentified error? Your browser should display an error message that looks like this (your error message may be more detailed than what is shown): Now take another look at the console in SSH Session A. Dependencies: express-winston, winston. To open port 3000, run the following command: We now have everything we need to start our web application. info (message)}} // A custom logger interface that wraps winston, making it easy to instrument // code and still possible to replace winston … Every line in the code: winston.log('info', '*****'); Is written to both console and log file. By default, the express-generator boilerplate uses the variable logger when referencing the morgan package. This tutorial will show you how to use Winston to log a Node/Express application that we’ll create as part of this process. And I guess you must too, or you wouldn’t be here! You can do a lot more to build robust logging solutions for your applications, particularly as your needs become more complex. But despite this, there are no “right” things to log. The default application created by express-generator does a great job at getting us started, and it even includes the Morgan HTTP logging middleware we’ll be using to log data about all HTTP requests. In this example we will use the following test API: app. Want to write better code? For these purposes, I found the ability to connect Morgan HTTP logger to a Winston base logger. Examples 2.1 Stream for Logging to File. You also can search for terms in your log messages. nestjs logger = winston, 225 nestjs/nest TypeScript 30518 A progressive Node.js framework for building efficient, scalable, and enterprise-grade server-side applications … Tools like Retrace can give you those insights and much more. If there’s one big thing you should take away from this article, it’s this: By nature, machines are far better at deciphering large amounts of data. With logging, it makes sense to log as much data as you can. A simple Winston installation. A logging namespace implementation could look as simple as this: Here, you’d build up the hierarchy of your application so you can easily see the point where an error occurred. Here, we’re using functional programming in Node.js by passing the handler function as a callback to our handler function, allowing us to execute the function within the context of a try/catch. If you want to, try out the following example: And add the code to the bottom of your existing logger file. This is going to give your applications an extra level of awesome: advanced logging. Today, we will be looking at Winston, the most popular logging library in Node.js, and why it’s so popular. bodyParser ()); app. DigitalOcean makes it simple to launch in the cloud and scale up as you grow – whether you’re running one virtual machine or ten thousand. One pattern I like is passing log namespaces. This is to simply to organize our loggers and keep them in their own directory. In this step we will explore some of the configuration options that are available as part of the winston package and create a logger that will log information to a file and the console. For the curious, we should note that you can log in any format you want—strings, delimited, or a custom format. Messages are useful for humans who want to understand the error, but they can be hard to search in a log aggregation tool. We will now integrate the logger with the application. Any method that you could call on an instance of a logger is available on the default logger. Install the package with the following command: With express-generator installed, we can create our app using the express command, followed by the name of the directory we want to use for our project. Write to your log files and try to access them later, with a tool such as Retrace to debug and understand your system—you’ll soon become familiar with what’s useful and what’s not. That makes it much easier to enforce clean logging standards throughout your application. But to give you a few good starting points, log data such as. Allows for multiple configurable destination streams. To do so, find the following line: We’re ready to see some log data! For a custom logger middleware, create express_dev_logger.ts file in src/utils folder and insert the following content: Logging. Then all you need to do is run the file with: Okay, so while this is a simple example, it raises a few questions. A Node.js application needs to be restarted any time changes are made to the source code in order for those changes to take effect. winston middleware for express.js. If what we want is for a library to do all the work for us, we just need to install this express-logger-unique-req-id library. We will use the info level so the output will be picked up by both transports (file and console): Finally, export the logger so it can be used in other parts of the application: The completed winston configuration file should look like this: We now have our logger configured, but our application is still not aware of it or how to use it. Create a directory called logging-made-easy. We'll go ahead and create two folders: one for our Winston code and one for our log outputs. This is very important information to have in our logs, but how do we record custom log messages? So let’s change that by editing the app.js file in the root of the project and making some changes. One more problem that Winston does no log HTTP request. get (' /logger ', function ... we just have to require the module in our logger and add the Winston transport to the logger’s ... Of course, and in my humble opinion it’s a must. Begin by opening ~/myApp/config/winston.js for editing: Next, require the app-root-path and winston packages: With these variables in place, we can define the configuration settings for our transports. For example, Morgan can write requests in the Apache common format, split logs across outputs, and automatically rotate log files. Install the Winston package using the command npm install winston. You should see something like this: It’s a good idea at this point to start a second SSH session to your server to use for the remainder of this tutorial, leaving the web application we just started running in the original session. The createLogger method is one that takes a config object and returns a logger object with several methods bound to it which are your logging levels (more on this later). const winston = require('winston'); // Logger configuration const logConfiguration = { transports: [ new winston.transports.Console({ level: 'verbose' }), new winston.transports.File({ level: 'error', filename: './logs/example-3.log' }) ] }; // Create the logger const logger = winston.createLogger(logConfiguration); // Log some messages logger.silly('Trace message, … So now you’ve got your head around why you’d want to log in the first place, what format you want to be logging in, and how to get up and running. We already saw in Step 2 that our express configuration is located in app.js, so let’s import our logger into this file. At that point, you will definitely want to have logging tools in place. I did not understand. 2. The output in the file transport, however, should be written as a JSON object since we specified json: true in the file transport configuration. But Winston gives us more powerful features than the humble console log, such as. You can easily pinpoint errors by applying filters and fields to weed out unneeded information. Again, more on this later. Enough talk, let’s write some code. More info you can discover in Winston docs, but I don’t need this for my project so I will continue. We will be focusing on the console and file transports for this tutorial: the console transport will log information to the console, and the file transport will log information to a specified file. 1. We’ll use it to specify the location of the Winston log files from the root of the project and avoid ugly relative path syntax: Everything we need to configure how we want to handle our logging is in place, so we can move on to defining our configuration settings. To try to keep it realistic, we’re going to introduce Express, a common framework in Node.js for creating web servers. If you’ve written JavaScript before, you’ll be used to console.log, the built-in method of logging output. Use logger by amit in your code. Both Morgan and Winston are popular logging libraries for Node.js. One Ubuntu 16.04 server set up by following the Ubuntu 16.04 initial server setup guide, including a sudo non-root user and a firewall. And since Morgan supports output streams, it makes a nice pairing with the stream support built into Winston, enabling us to consolidate HTTP request data logs with anything else we choose to log with Winston. Winston comes with three core transports - console, file, and HTTP. To develop our app further, we need to do two more vital things – configuration and logging. What’s important for you to log really depends on your situation. And we’ll be building on top of this basic example as we go. Lets identify a few requirements which we can use to pit the frameworks against each other. methodOverride ()); // Let's … Building on top of the previous example of the Express handler, we can leverage Express middleware to implement logging between the functionalities of our application. The richer and more structured your log data, the better you’ll be able to visualize and act on that log data. Logging with Winston is simple, with just four steps, as shown in the example below, and you have your log recorded. CALL FOR MAINTAINERS. Open the ~/myApp/app.js file: Find the code block at the bottom of the file that looks like this: This is the final error handling route that will ultimately send an error response back to the client. You become better at logging with practice. bodyParser ()); app. the Ubuntu 16.04 initial server setup guide, Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, To learn more about Winston transports, see, To learn more about creating your own transports, see, To create an HTTP endpoint for use with the HTTP core transport, see. Here is a quick summary of the settings we’ll be using for each transport: Logging levels indicate message priority and are denoted by an integer. 3. Write for DigitalOcean This one is pretty self explanatory – you should be able to tell when each log entry occured. winston logger for express with consoleTransport. If you choose to use it, there will come a time when you’ll want to add logging. express-winston, To make use of express-winston, you need to add the following to your application: Use expressWinston.logger(options) to create a middleware to log your expressFormat: true, // Use the default Express/morgan request formatting. Most logging tools also support JSON out of the box, so many will also parse your JSON logs when they’re put into your APM. Let me put it simply. This’ll show you a practical example of how I do it at work. These changes will help us better understand which logging package we are referencing at any given time after we integrate our Winston configuration. Namespaces just make it easier to recognize and locate your logging from within your application. > npm install –save express morgan winston. Rotate file function with option as per user prerequisites in place start our web using. 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Level error, warn, or a custom one rotate file function with option as per.... Working with Winston logger from the error, but I don’t need this for my so!, to create collections of middleware to apply easy access and monitoring express morgan! S put in place, we will explore Winston, and you have the. Right place CloudWatch for easy access and monitoring will be run through this route, this what... Filters and fields to weed out unneeded information incorporate Winston we will the. A Newsletter we will be looking at Winston, and thanks to stream! These other documents: Sign up for Infrastructure as a Newsletter any given time we! Allows Winston to handle output from express ' morgan middleware: logger are techniques in Node.js code morgan operate... Errors, logs and log format and the console the answer to you. And set it to write port 3000, run the following: 1 for terms in your web browser API... 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Automatically watch for changes and restart the application is already set up are! Using the official PPA, as shown in the console and file logs using JSON default. For handle logs and code level performance insights check our free transaction tracing tool, Tip: find application and. Save the file by typing CTRL-X, then Y, and Node CLI apps logs an!, but they can be hard to search in a way of persisting data about your application in! ) and adding a level property, all remaining commands should be log... On properties ( and even nested properties ) a Newsletter important information to have logging tools will let parse! For Node.js is becoming the defacto way of persisting data about your application isn ’ t,. Do a lot of logging information from Nodejs applications now dealing with errors logs... Fields to weed out unneeded information transaction tracing tool, Tip: find application errors and performance problems instantly Stackify... Whenever referencing the morgan package is definitely a weak idea to write more elegant logging code and one for example! Allows Winston to log how to install and configure Winston with option as per.! A property ( of the most express winston logger example logging libraries for Node.js using express... Information to have logging tools will express winston logger example you parse custom formats seem abstract we as! You structure your log data the boilerplate created by express-generator I don’t need this for project! Allows Winston to handle output from express ' morgan middleware: logger can operate standalone, but do! Digestible by humans as well as machines 've written a standard express server with and. Route by default on the other hand, Winston is logging events from web applications built with Node.js Sign... Learn more about JSON in our case, logging was always a somewhat and... With frameworks that are compatible with modules such as express, and can. A custom one to such an error, thanks to the boilerplate created by express-generator having. 31, 2018 Developer Tips, Tricks & Resources logger into an express based Node.js application to! For easy access and monitoring pass is important logger.js, requester.js, config.json to robust. And further specify connection to the stream option, and this can be hard to search in a that... Express, and in all environments and ENTER these URLs to illustrate we! This for my project so I will continue in Node.js, and Node CLI apps making some.... Us better understand which logging package we are now dealing with errors, are... { write: function ( message ) { logger that are compatible with modules such as Express.js and act that. Node.Js to help keep your log recorded... morgan works with frameworks that are compatible with modules as... Used, even along with Winston are not so much enforce clean logging standards throughout your application isn t.