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Troubleshoot in Visual Studio Code directly from the web client

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With Business Central 2023 release wave 2, you can open a new Visual Studio Code session directly from the web client for a specific customer production or sandbox environment. Opening the session directly, enables performing troubleshooting, such as debugging, inspecting variables, setting breakpoints, and viewing source code.

Depending on the context, Visual Studio Code opens to allow inspecting objects and source, and allows attaching to debug or snapshot debug and profile the current web client session. Whether you can access the source code is gated by the resource exposure profile settings for each extension. Learn more in Resource exposure policy setting.

From the Business Central web client, you can open Visual Studio Code in the following ways:

Open a page from the Page Inspector

From a page in the Business Central web client, you can open the Page Inspection page and explore the code behind it in Visual Studio Code. Learn more about page inspection in Page inspection.

Page Inspection Open in VS Code.

To open and explore a page from the Page Inspector, follow these steps:

  1. Locate the page that you want to inspect.
  2. From that page, run the Page Inspection with Ctrl+Alt+F1.
  3. Choose the Explore page in Visual Studio Code link.
  4. Next, to open a Visual Studio Code instance, you must choose the Open button in the Allow an extension to open this URI? dialog. If you already have Visual Studio Code running that instance opens.
  5. Then, you must specify, if you want to create a new project, or use an existing project. You're only asked the first time, and from then on, the Visual Studio Code window that was last active is used.
  6. Next, you must decide if you want to download symbols.

    Note

    If you specify yes, the app.json file will be updated with the dependent extensions of the page, which are shown on the Extensions tab in the Page Inspection page, and the symbols will automatically be downloaded. You can specify no, if you're already working on the specific source code files.
    If you say no, and don't have the right symbols downloaded, you won't be able to navigate to the object source code.

  7. Now, you're prompted whether to do a snapshot or regular debugging session, or not to debug, but just view the source code.

    Note

    For production environments, regular debugging isn't supported.

  8. If you want to debug, then set breakpoints and go back to the web client to run the task. When the breakpoint is hit, you can inspect the code in Visual Studio Code.

You can also choose to inspect a specific field on a page.

  1. Locate the page that you want to inspect.
  2. From that page, run the Page Inspection with Ctrl+Alt+F1.
  3. Choose the field to inspect, select the dropdown menu, and then choose Explore field in VS Code. The source code for the table field definition behind the page field is now opened.

Troubleshoot from the Help and Support page

In the Business Central web client, you can open the Help and Support page and explore the code behind it in Visual Studio Code.

Attach Debugger to this session.

To attach the debugger to a session, do the following:

  1. Go to the Help and Support page, and then choose the Attach debugger to this session link under the Troubleshooting section.
  2. Next, to open a Visual Studio Code instance, you must choose the Open button in the Allow an extension to open this URI? dialog. If you already have Visual Studio Code running that instance opens.
  3. Then, you must specify, if you want to create a new project, or use an existing project. You're only be asked the first time, and from then on, the Visual Studio Code window that was last active is used.
  4. If you want to debug, then set breakpoints and go back to the web client to run the task. When the breakpoint is hit, you can inspect the code in Visual Studio Code.

    Note

    For production environments, regular debugging isn't supported.

Open source code in Visual Studio Code

APPLIES TO: Business Central 2024 release wave 2 and later.

With the Open Source in VS Code option, you can get the latest source code from an extension and open it directly in Visual Studio Code. The open source functionality uses the repo metadata that was included in the extension when it was built. In the manifest of an extension, the app.json file, you can specify metadata for where the related GitHub repository and a specific build are found by using the build and source settings. Learn more in JSON files.

Opening the source code enables investigating issues or developing new functionality based on an existing extension. You must have access to the code through GitHub to be able to open the source code through Visual Studio Code.

Follow these steps:

  1. Open the Extension Management page and activate the context menu for the selected extension.
  2. Choose the Open Source in VS Code option.
    In Visual Studio Code, you're now asked if you want to clone or open the GitHub repo for the extension. If you choose to clone the repo, you must specify where you want to clone the repo to on your local computer.
  3. Once the repo is cloned, you have different options for working with the source code. You can, for example, stay on the current main branch, or you can create a new branch for your modification.
    If you choose to create a new branch, you must give it a name.
  4. With access to the source code on your local computer, you can, for example, use the Page Inspector to help you navigate to the source code by using the Explore page in Visual Studio Code functionality. Learn more in Open a page from Page Inspector.

Good to know

  • If Visual Studio Code is already open, the last active session is used; otherwise, a new Visual Studio Code session opens. If the AL Language extension isn't installed, the user is asked to install it, and the process ends.
  • When invoked, a new project is created, and a matching launch configuration is created, depending on the current environment being a production or sandbox environment.
  • If the user chooses to debug, Visual Studio Code attaches to the web client process, which it was invoked from and awaits breaking on error.
  • If reusing a project and the source files aren't up to date with the version on the server, the breakpoints won't be hit correctly when debugging. Learn more in Snapshot debugging.
  • When you choose to generate new projects, remember to delete the projects occasionally to not accumulate many unused projects.
  • Running the web client in a browser, you're typically not running the browser as an administrator, which means that Visual Studio Code also doesn't open in administrator mode. So, for example, if Visual Studio Code prompts you for an update, and you choose yes, you get an error, because you don't have permissions to update. It's then recommended to shut down Visual Studio Code, and reopen it as an administrator and update it. Then, you can continue debugging.

Resource exposure policy setting
Debugging
Snapshot debugging
Page inspection