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Learn how to set up debugging for your Angular applications using Visual Studio Code and a custom `localhost` URL to easily bind breakpoints and improve your development experience.
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Debugging Angular in Visual Studio Code with a Custom localhost URL

When working with Angular projects, developers often find themselves needing to configure their debugging environment effectively. One common scenario arises when you want to set up Visual Studio Code (VSC) to debug your application using a custom localhost URL, rather than the default setup. This can cause some challenges, particularly with binding breakpoints correctly. In this guide, we'll explore how to tackle this problem and get your debugging environment running smoothly.

The Problem: Breakpoints Not Binding

After initializing a blank Angular project with the command ng new and setting up VSC with a specific configuration in your launch.json file, you might run into issues where breakpoints do not bind properly. Here's a quick overview of the steps you might have taken before hitting this snag:

Created your Angular project: Using ng new, a new Angular app is set up.

Configured launch.json: You modified the launch.json file to include a custom URL like http://localhost-app.myapp.com:4200.

Updated your hosts file: You mapped 127.0.0.1 to your custom URL.

Modified the start script: Changed the package.json start script to use ng serve --disable-host-check.

While the application might run just fine using the custom URL, the VSC debugger fails to make connections with your breakpoints. The debugger works fine when using the standard localhost URL, but this isn't ideal for scenarios requiring a custom setup.

The Solution: Removing VS Code Proxy Configuration

If you're stuck with breakpoints not binding while trying to debug using your custom URL, the solution often lies in the VSC proxy configuration. In many instances, the presence of a proxy can interfere significantly with the source map discovery process. Here’s a breakdown of how to address the issue:

1. Check for Proxy Configuration

Open your Visual Studio Code settings and look for any proxy configurations that might be affecting your project.

Make sure to disable the proxy if it's configured and not needed.

2. Disable any other interfering extensions

Some extensions may have proxy settings or might affect debugging capabilities. Try disabling them temporarily to see if it resolves the problem.

3. Ensure Source Maps are Enabled

Source maps are crucial for link debugging with breakpoints. Ensure that your Angular build includes source maps:

Check your angular.json file and confirm that sourceMap is set to true for your build configurations.

4. Restart Your Debug Session

After making the above changes, make sure to restart VSC and then try debugging again. Sometimes, changes may not take effect until the IDE has been restarted.

Conclusion

Debugging Angular applications in Visual Studio Code can be straightforward, but using a custom localhost URL can sometimes complicate things. The key takeaway is to be mindful of any proxy settings that might block source map discovery, preventing breakpoints from binding correctly. By following the steps outlined in this guide, you should be able to set up a successful debugging environment for your Angular projects.

Happy coding, and happy debugging! If you encounter other issues or have additional tips, feel free to share your experiences in the comments section below.