JavaScript debugging in major browsers

There are a few things in the development world that can make a big difference to the quality of your JavaScript code. Effective JavaScript debugging is one of them.
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JavaScript debugging in major browsers

Every major browser, from Google Chrome to Firefox, comes with a built-in debugging tool that surfaces any issues quickly. With better use of browser-based debugging tools, you can diagnose and debug JavaScript issues much faster so you can create better quality code, faster.

Who is this guide for?

If you want to make sure that your code is of the highest quality and you’d like to make the most of your built-in browser debugging tools, this guide is for you. Whether you are just learning the ins and outs of debugging or are a seasoned pro looking for easy-to-follow instructions, you’ll find this step-by-step guide to debugging JavaScript in major browsers a good coding companion.

We’ll also be using Raygun Crash Reporting in each guide to help us get more diagnostic details like stack trace. Make sure to sign up for a free 14-day trial before you start. 

How to use this guide

In the following chapters, we’ll break down the steps to debug JavaScript by the browser. We’ll use working examples and actionable instructions throughout. Just jump to the browser debugging tool you’d like to use, and follow along step-by-step.

JavaScript debugging in Google Chrome

Chrome DevTools is a set of web authoring and debugging tools built into Google Chrome. Use the DevTools to iterate, debug, and profile a website, but in this guide, we’ll look at debugging specifically.

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JavaScript debugging in Firefox

Firefox debug console makes it easy to debug code running on Firefox. Updated in 2017 to offer advanced search, navigation, and debugging capabilities, Firefox’s debugging tool is cited as one of the best.

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JavaScript debugging in Microsoft Edge 

The Edge DevTools are a powerful toolset built into the Edge browser on Microsoft Windows 10. Microsoft is throwing a lot behind its Chromium-based browser, and it’s already number 3 in the market behind Chrome

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JavaScript debugging in Internet Explorer 11 

Although Microsoft Edge is the latest version, many users still use IE 11 as their main browsers, which is why we chose to include this guide. It’s still one of the most popular browsers, with a global market share of 6.14%.

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JavaScript debugging in Opera

Opera’s switch to the Blink rendering engine in 2013 made debugging in Opera fast and efficient. The best news is that the process is similar to Chrome DevTools, and with the plethora of resources out there for Chrome, debugging in Opera is a breeze.

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JavaScript debugging in Safari

With Apple’s Safari Web Inspector, you’ll be debugging iOS apps in no time. Web Inspector is a powerful tool that makes it easy to modify, debug, and optimize your web and mobile apps. Web Inspector acts as your command center, and we’ll walk through exactly how to use it to debug your iOS apps.

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JavaScript debugging in Mobile Safari (iOS) 

This article will focus on debugging JavaScript code being run in Safari on iOS devices using the desktop Safari Web Inspector. Being able to debug code being run on an iOS device through the desktop developer tools that we’re familiar with is a huge benefit and can reduce debugging time dramatically. Apple’s great UI is a bonus.

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JavaScript debugging in Visual Studio

The Visual Studio debugger exists to help you observe the run-time behavior of your program and find any problems. This guide will show you step-by-step the most efficient way to debug your apps with the Visual Studio debugger.

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JavaScript debugging tips

Despite JavaScript's reputation as being difficult to debug, if you keep a couple of tricks up your sleeve errors and bugs will take less time to resolve.

We've put together a list of 16 debugging tips that you may not know, but might want to keep in mind for next time you find yourself needing to debug your JavaScript code!

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