Debugging Angular CLI Applications in Visual Studio Code

Debugging Angular CLI Applications in Visual Studio Code

In this post, we are going to create an Angular CLI application, then add configuration to debug it in Visual Studio Code.

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TLDR - For an Angular CLI application, create a debug configuration in VS Code, install the Debugger for Chrome extension, then run in debug mode.

Learn VS Code

Learn VS Code

If you're interested in learning more about VS Code, you definitely want to check out the upcoming Learn VS Code course.

Creating a Starter Project

To be able to test an Angular CLI application, you need an Angular CLI application :) I'll provide the basic steps, but for more reference on how to get started look at the Angular CLI page.

Angular CLI

First, you'll need to install the Angular CLI.

npm install -g @angular/cli

After that finishes, you'll need to actually generate your new application. This will take a bit as it needs to install LOTS of NPM packages.

ng new my-app

Open the project in VS Code and you should see the following.

Angular CLI Project in VS Code

Now, that you've got your new fancy Angular app, go ahead and run it to make sure everything looks right.

ng serve

Should look like this.

Angular CLI App Running

Creating Debug Configuration

Assuming you've made it this far, we are ready to start debugging! Before we do, however, it's worth understanding how configuring debugging in VS Code works. Basically debug configurations are saved in a launch.json file which is stored inside of a .vscode folder. This .vscode folder is used to store different configurations for Code including our required debugging stuff.

Before you create your debug configuration, you need to install the Debugger for Chrome extension. Find and install this extension from the extension tab in VS Code. After installing, reload VS Code.

Debugger for Chrome

Now, to create a debug configuration, you can open the debug panel (the bug looking button on the left panel). At the top of the debug panel, you should see a dropdown that says "No Configurations".

Create Debug Configurations

To the right of that dropdown, there is a gear icon. Click this button to have VS Code automatically generate that .vscode folder and launch.json file mentioned above.

Then choose Chrome.

You should get the following configuration created for you.

Angular CLI Debug Configuration

The only thing we need to do is update the port from 8080 to 4200.

Updated Angular CLI Debug Configuration

Let's Debug

Now we're ready! Go ahead and click the play button at the top of the Debug panel which will launch an instance of Chrome in debug mode. Keep in mind your app should already be running from using ng serve earlier. In VS Code, you should see the Debug toolbar pop up.

With this up and running, you can set a breakpoint in your App.component.ts. Open up your App.component.ts and add a breakpoint inside of the component by clicking in the gutter (to the left of the line numbers). Should look like this.

Now, refresh debugging by clicking the refresh button on the debugging toolbar. This should open your application again and trigger this breakpoin. You should be directed back to VS Code directly to the place where you set your breakpoint.

From here, you can set more breakpoints, inspect variables, etc. If you are interested in learning more about debugging JavaScript in general in either Chrome or VS Code you can check out Debugging JavaScript in Chrome and Visual Studio Code.

Again, if you're interested in learning more about VS Code, you'll definitely want to check out the upcoming Learn VS Code course.

If you have any follow up questions or comments, leave one below of find me on twitter @jamesqquick.

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