As you may know, the next version of Microsoft Edge will adopt the Chromium open source project to create better web compatibility and less fragmentation of different underlying web platforms.

Starting with Visual Studio version Head to visualstudio. NET Core applications. NET Core application. The Fibonacci sequence is a series of numbers where each number is the sum of the two preceding ones, starting with 0 and 1.

Start by modifying App. Add the code below to your new component:. Now click the green Play button or press F5 on your keyboard. Visual Studio will start your web application and Microsoft Edge will automatically launch and navigate to your app.

Click on Fibonacci. We know that the 8 th term should be 13 but our code is saying that the 8 th Fibonacci number is 8! Switching back to Visual Studio, since our calculateFibonacci function prints to the Console, you can actually see that log in the Debug Output.

Note : If you have not enabled JavaScript debugging before, your JavaScript breakpoint will not bind successfully. Visual Studio will ask if you want to enable JavaScript debugging and then restart the debugging process and bind your breakpoint.

We know that the first two terms in the Fibonacci sequence are 0 and 1. The third term should also be 1. This is what Visual Studio should look like now:. Click the Step Over button or press F You will now see that our code is paused at Line Net Projects in Visual Studio. To enable both browsers:.

When your launch config is set up, you can debug your project. Pick a launch config from the dropdown on the Debug pane in Code. Press the play button or F5 to start. The extension operates in two modes - it can launch an instance of Microsoft Edge navigated to your app, or it can attach to a running instance of Edge. Both modes require you to be serving your web application from a local web server, which is started from either a VS Code task or from your command-line.

You can configure these modes with a. You can create this file manually, or Code will create one for you if you try to run your project, and it doesn't exist yet. Below are two example launch. You must specify either file or url to launch Microsoft Edge against a local file or a url. If you use a url, set webRoot to the directory that files are served from. If the stable release of Microsoft Edge Chromium is on your machine, this debug adapter will launch it by default. If you'd like to launch a different channel of Microsoft Edge Chromiumsimply add a version attribute to your existing configuration with the version you want to launch devbetaor canary.

The example configuration below will launch the Canary version of Microsoft Edge Chromium :. If you want to use a different installation of a Chromium-based browser, you can also set the runtimeExecutable field with a path to the browser executable. Note that if you are using the runtimeExecutable flag, you should not be using version.

You will have the same default configuration as above. With "request": "attach"you must launch Microsoft Edge with remote debugging enabled in order for the extension to attach to it. Here's how you can do that:. The example launch. You can also use the debugger to launch applications that are using an embedded Microsoft Edge Chromium WebView. With the correct launch. To use the debugger against a WebView application use the following properties in your launch config:.

Debug JavaScript in Microsoft Edge from Visual Studio

In basic scenarios, your host application is using a single WebView that is loaded on launch of your application. If this is the case, you should set useWebView to be true. This will treat the host application just like it was another browser, attaching to the WebView on launch and failing with a timeout if it cannot find a matching url or urlFilter within the timeout. In more advanced scenarios, your host appliation may be using a single WebView that doesn't load until later in your workflow.Select "Edge" in the dropdown.

You will now see a launch.

how to debug javascript in edge browser

If you want to launch Microsoft Edge Chromiumthe next version of Microsoft Edge, instead of Microsoft Edge EdgeHTMLsimply add a version attribute to your existing configuration with the version of Microsoft Edge Chromium you want to launch devbetaor canary. The configuration below will launch the Canary version of Microsoft Edge Chromium :. From your terminal, run the following command:. Send us your feedback by filing an issue against this extension's GitHub repo. You can drag this file into an issue comment to upload it to GitHub.

If you want to help us make this extension better, we welcome your contributions! You can find everything you need to get started in our GitHub repo. You may also leave feedback directly on GitHub. Skip to main content. Exit focus mode. Feedback Send us your feedback by filing an issue against this extension's GitHub repo.

Related Articles Is this page helpful? Yes No. Any additional feedback? Skip Submit. Send feedback about This product This page. This page. Submit feedback. There are no open issues. View on GitHub. Is this page helpful?Use the Debugger to step through code, set watches and breakpoints, live edit your code and inspect your caches.

Test and troubleshoot your code by:. Often the first step in debugging is to set breakpoints in the code you're looking to troubleshoot.

You can find all the code files currently loaded by the page from the Resource picker pane, including. Clicking on a file entry will open a tab for that file in the Debug window and bold the text of the file name to indicate this as devtools-guide file name is in the illustration above.

You can then set breakpoints within that file from the Debug window. The toolbar provides different search options, including regular expressions. Clicking on a search result will focus the Debug window on the specified file and line. The Debug window is where you set your breakpoints, step through code, and live edit your script as you debug.

Click to the left of any script command to add or remove a Breakpoint. Use the right-click context menu or Breakpoints pane to Add a condition to the breakpoint by supplying a logical expression that causes the debugger to break if it evaluates True at that location. You can edit your JavaScript live during a debugging session.

Click the Compare document to original button to view the diff of what you changed. Adds line breaks and curly brace alignment per JavaScript conventions. Even compressed code that's been made more readable with this option may have function, selector, and variable names that are much different than in your original source code. In these cases, the Toggle source maps option might be available. Adjusts code to fit within the current margins of the debug window eliminating the need for horizontal scrolling.

By default, the Debug just my code toolbar button is on, meaning that the debugger will skip over any files that you mark as library code and they will not appear in the debugger call stack. For keeping track of libraries across debugging sessions, you can edit these files to maintain a default list or add wildcards for a domain or file type:. You will see the Toggle source maps button enabled for code written in a language that compiles to JavaScript or CSS and that provides a source map an intermediate file mapping to the original source.

This option directs the debugger to present the original source to use for debugging rather than the compiled file that's actually running in the browser. The DevTools will check if the compiler that generated the JavaScript file included a comment with the name of the map file.

For example, if a compiler compressed myfile. If the DevTools can't find the map automatically, you can choose a source map for that file. Right-click the file's tab to find the Choose source map option.

The complete guide to debugging JavaScript in major browsers

Use the debugger Toolbar to control how you step through code, and what code to step through or ignore. From here you can also do a full text search across your code files for specific strings. Continue F5 continues code execution to the next breakpoint. Holding down F5 will repeatedly move past breaks until you release it. The debugger will step to the next statement if it is not at a function when these commands are used.

Breaks on the creation of a new web worker. By default exceptions are ignored by the debugger and logged to the Console.

how to debug javascript in edge browser

You can choose to Break on all exceptionsor just those not being handled by try Currently disabled. If the text is found, it opens the first file matching the search string. Pressing Enter or F3 takes you to the next match.

Use the Watches pane to browse a catalog of all objects and variables Localsboth in the local and global scope, available to the statement that is the focus of the current break in the debugger.

how to debug javascript in edge browser

The Call stack tab shows the chain of functions that led to the current point of execution. The current function appears at the top, and the calling functions appear below it in reverse order. From the Breakpoints tab, you can manage you breakpoints and event tracepoints, including setting conditions, disabling and deleting them.Finding a series of actions that consistently reproduces a bug is always the first step to debugging.

Click Open Demo. Open Demo. Click Add Number 1 and Number 2. The result should be 6. This is the bug you are going to fix.

Microsoft Edge (EdgeHTML) Developer Tools

DevTools provides a lot of different tools for different tasks, such as changing CSS, profiling page load performance, and monitoring network requests. The Sources panel is where you debug JavaScript. This shortcut opens the Console panel. The Console panel. The Sources panel. The 3 parts of the Sources panel UI. A common method for debugging a problem like this is to insert a lot of console. For example:. The console. A breakpoint lets you pause your code in the middle of the runtime, and examine all values at that moment in time.

Breakpoints have a few advantages over the console. In short, breakpoints may help you find and fix bugs faster than the console.

Therefore, you probably want to pause the code around the time that the click listener runs. Event Listener Breakpoints let you do exactly that:. DevTools reveals a list of expandable event categories, such as Animation and Clipboard. Next to the Mouse event category, click Expand. DevTools reveals a list of mouse events, such as click and mousedown. Each event has a checkbox next to it. Check the click checkbox. DevTools is now set up to automatically pause when any click event listener runs.

The click checkbox is enabled. Back on the demo, click Add Number 1 and Number 2 again. DevTools pauses the demo and highlights a line of code in the Sources panel. DevTools should pause on line 16 in get-started. If you pause on a different line of code, press Resume Script Execution until you pause on the correct line.

If you paused on a different line, you have a browser extension that registers a click event listener on every page that you visit. You were paused in the click listener of the extension. If you use InPrivate Mode to browse in privatewhich disables all extensions, you may see that you pause on the desired line of code every time. Event Listener Breakpoints are just one of many types of breakpoints available in DevTools. It is worth memorizing all the different types, because each type ultimately helps you debug different scenarios as quickly as possible.

One common cause of bugs is when a script runs in the wrong order. Stepping through your code enables you to walk through the runtime of your code, one line at a time, and figure out exactly where it is running in a different order than you expected.

Try it now:. Click Step over next function call.There are a few things in the development world that can make a huge difference to the quality of your JavaScript code.

Effective JavaScript debugging is one of them. Every major browser, from Google Chrome to Firefox, comes with a built-in debugging tool which 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.

Chrome DevTools is a set of web authoring and debugging tools built into Google Chrome. Take me to the JavaScript debugging in Google Chrome guide. Firefox debug console makes it easy to debug code running on Firefox. Take me to the JavaScript debugging in Firefox guide. Although Microsoft Edge is the latest version, many users still use IE as their main browsers, which is why we chose to include this guide. Take me to the JavaScript debugging in Internet Explorer guide.

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. Take me to the JavaScript debugging in Opera guide. Web Inspector is a powerful tool that makes it easy to modify, debug, and optimize your web and mobile apps. Take me to the JavaScript debugging in Safari guide. Safari Develop Menu provides tools you can use to make sure your website works well with all standards-based web browsers.

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. Take me to the JavaScript debugging in Visual Studio guide. Free trial. Most recent Product Developer tips Search.

how to debug javascript in edge browser

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Are you fortunate enough to have a choice? C Logging best practices in with examples and tools Applications that have been deployed to production must be monitored. One of the best ways to …. Who is this guide for?This documentation is for extensions for the legacy version of Microsoft Edge. The new Microsoft Edge program is now open to accept chromium-based extensions for the new Microsoft Edge v77 or later. If you want to submit a new extension, visit Publish to Microsoft Edge Chromium Addons Store to learn about the submission process.

With this announcement, Microsoft is no longer accepting new extensions for the legacy version of Microsoft Edge. If you own an Extension for the legacy version, you should begin the process of porting your Extension to the new Microsoft Edge.

The new Microsoft Edge is based on Chromium, so Extensions designed for the legacy version of Microsoft Edge do not work with the new version. The following video goes through a buggy Microsoft Edge extension, walking though each debugging scenario and fixing it up along the way. See the step-by-step instructions below for more info. In order to take advantage of extension debugging with F12, you must first turn on developer features in about:flags. See Adding and removing extensions for details on how to do this.

Launch F12 by either navigating to the More Navigate to and select your extension's content script. Content scripts for extensions currently running will be depicted by a different folder for each extension.

Debugging webpages with the browser console - Computer programming - Khan Academy

Place breakpoints for debugging by clicking to the left of the source code line number. There are two methods that can be used for accessing the source code of your extension page for debugging.

One method applies to a variety of pages while the other only works for popup pages. Select the Console tab and execute the command location. This will re-execute the page script, allowing you to step through your code.

While the method for debugging extension pages also applies to popup extension pages, the following steps outline another way to debug your popup:. You may also leave feedback directly on GitHub.

Skip to main content. Exit focus mode. Important The new Microsoft Edge program is now open to accept chromium-based extensions for the new Microsoft Edge v77 or later.

Note In order to take advantage of extension debugging with F12, you must first turn on developer features in about:flags. Is this page helpful? Yes No. Any additional feedback? Skip Submit. Send feedback about This product This page. This page. Submit feedback.

There are no open issues. View on GitHub.