Book Image

Modern JavaScript Web Development Cookbook

By : Federico Kereki
Book Image

Modern JavaScript Web Development Cookbook

By: Federico Kereki

Overview of this book

JavaScript has evolved into a language that you can use on any platform. Modern JavaScript Web Development Cookbook is a perfect blend of solutions for traditional JavaScript development and modern areas that developers have lately been exploring with JavaScript. This comprehensive guide teaches you how to work with JavaScript on servers, browsers, mobile phones and desktops. You will start by exploring the new features of ES8. You will then move on to learning the use of ES8 on servers (with Node.js), with the objective of producing services and microservices and dealing with authentication and CORS. Once you get accustomed to ES8, you will learn to apply it to browsers using frameworks, such as React and Redux, which interact through Ajax with services. You will then understand the use of a modern framework to develop the UI. In addition to this, development for mobile devices with React Native will walk you through the benefits of creating native apps, both for Android and iOS. Finally, you’ll be able to apply your new-found knowledge of server-side and client-side tools to develop applications with Electron.
Table of Contents (15 chapters)

Adding logging with Winston

Let's start with a simple, basic need: logging. Having solid, correct logging set up can help you find problems quickly, while incomplete or otherwise lacking logging can make you look for hours for what could be a simple, trivial problem. A basic rule for any application is to ensure that proper login is set up so that you can be confident that any situation that comes up will at least be recognized and recorded for future analysis.

The first idea you could have is to just use the console family of functions, such as console.log(), console.warn(), console.info(), and more. (For a complete reference, check out https://developer.mozilla.org/en-US/docs/Web/API/console.) While these are good for quick debugging, they just don't do it for application-level logging. You should be able to select what kind of logs you want (everything? Errors only...