Using the Code Analysis Tools with the Ruleset

This article helps you to customize a ruleset for the severity of diagnostics produced by the code analysis tools that are part of the AL Language extension for Visual Studio Code.

Use rulesets with code analysis

First, create a basic project in AL by following the steps below:

  1. Press Alt + A, Alt + L to create a new project.
  2. Open the Command Palette by using the Ctrl+Shift+P shortcut and choose either User Settings or Workspace Settings.
  3. Under Extensions, go to Al Language extension configuration. When you scroll down, you'll find Code Analyzers section, choose Edit in settings.json.
  4. Set the al.enableCodeAnalysis in the settings file to true.
    "al.enableCodeAnalysis": true
  5. In the al.codeanalyzers setting, use Ctrl+Space to pick from the available code analyzers. Separate the list of code analyzers with commas. For more information about the available analyzers, see AppSourceCop, CodeCop, PerTenantExtensionCop, and UICop.

At this point, the selected analyzers will run on your project. Next, add some code to the project that will, in the following example, be used to demonstrate violations of the AA0001 "There must be exactly one space character on each side of a binary operator such as := + - AND OR =." code analysis rule.

Add your own code to the project

In the Visual Studio Code Explorer, open the file and replace the existing code with the following code:

pageextension 50100 CustomerListExt extends "Customer List"
    trigger OnOpenPage();
        result: Integer;
        // The following line will trigger the warning
        // AA0001 "There must be exactly one space character on each side 
        // of a binary operator such as := + - AND OR =." 
        result := 2+2; 
        Message('2 + 2 = ' + Format(result));

On the View tab of Visual Studio Code, select the Problems option and you'll see a warning with the message "There must be exactly one space character on each side of '+'.". In this case, the problem can be fixed by running the AL Formatter command. For more information, see AL Formatter.

Create and customize a ruleset

To create and customize a ruleset of your own, follow the next steps:

  1. On the File tab in Visual Studio Code, choose New File.

  2. Save the empty file with a name, for example <name>.ruleset.json and make a note of the file path.

  3. Add the following code to the <name>.ruleset.json file:

        "name": "My Custom ruleset",
        "rules": [
                "id": "AA0001",                    
                "action": "None"
  4. In your project settings, set Rule Set Path to the path of the <name>.ruleset.json file, relative to the project root. For more information about custom rules, see Ruleset for the Code Analysis Tool.


Use the truleset and trule snippets provided by the AL Language extension to create your ruleset. The ruleset will be applied to all the analyzers enabled for the current project. For more information about selectively enabling analyzers, see The Code Analysis Tools.

Running the code analysis

The code analysis will run in the background and you'll see the warning "There must be exactly one space character on each side of '+'." disappear from the Problems option in Visual Studio Code.

To trigger a new compilation manually, use the Ctrl+Shift+B shortcut to build your project. For more information about AL keyboard shortcuts, see Keyboard shortcuts.


Changing the contents of the ruleset file won't be detected by the AL Language extension. To see the effects of changing the ruleset file, you can try any of the following steps:

  • Reload the window.
  • In the project settings, change the Rule Set Path setting to an invalid path and save it. Then change it back and save again.

See also

Ruleset for the Code Analysis Tool
Using the Code Analysis Tools
Directives in AL
Development in AL
Debugging in AL
AL Language Extension Configuration