Debugging

Compiling your application using wails build -d will create a debug version of your application. This means the following:

• Logs will be output to the console it was started in
• You can control the log level by using the -loglevel flag when launching your application
• The Developer tools will be accessible in your app via the right click menu (Linux & Mac)

Debugging using Visual Studio Code

Modify/create the following files in the .vscode directory (create if it doesn’t exist) in the root of your project, replacing myapp for your project binary name:

launch.json

{
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Wails: build debug",
      "type": "go",
      "request": "launch",
      "mode": "exec",
      "program": "${workspaceFolder}/build/myapp",
      "preLaunchTask": "wails_debug_build",
      "env": {},
      "args": []
    }
  ]
}

tasks.json

{
  "version": "2.0.0",
  "tasks": [
    {
      "label": "wails_debug_build",
      "type": "shell",
      "command": "wails build -d"
    }
  ]
}

Windows

On Windows, the Webview component doesn’t have developer tools natively, however there are a couple of ways to attach a remote debugger:

Debugging using IEChooser/F12Chooser

It’s possible to use a little-known utility for attaching the IE dev tools to your application: IEChooser.exe (or F12Chooser.exe depending on your windows version). The steps to attach are:

1. Launch your Wails app
2. Run C:\Windows\System32\F12\IEChooser.exe (or F12Chooser.exe)
3. Select the application - it usually appears as about: blank
4. The dev tools will attach to the app

Note: This video is high resolution. Best viewed full screen.

Debugging using Visual Studio

It’s possible to debug in Visual Studio by doing the following:

• Install a recent version of Visual Studio (The free “Community” Edition is fine. The following steps are based on VS 2017). Make sure the “ASP.NET and web development” workload is selected in the installer;

• Open Debug -> Attach to Process…;

• Click Select… and choose Debug there code types: -> Script

• Find and select the process of your Wails application in Available Pocesses;

• Click Attach. The DOM Explorer and JavaSript Console should now show up. If not, open them in Debug -> Windows.

Many thanks to our friends over at DeskGap for this information!