> For the complete documentation index, see [llms.txt](https://windows.help.formit.autodesk.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://windows.help.formit.autodesk.com/plugins/how-to-develop-plugins/advanced-development/debugging.md).

# Debugging

Debugging a FormIt plugin requires different procedures depending on the engine you are debugging. (For more information on engines check the [previous section](/plugins/how-to-develop-plugins/advanced-development/client-side-vs-web-side-engines.md))

### **Client-Side (FormIt) Debugging**

To debug in FormIt-side code, which applies to both toolbar- and panel-based plugins, you can add a line in the code to pop the desktop application's built-in JS debugger:

`debugger`

![](/files/CDu1LvrNmePB4Oh8BYsz)

### **Web-Side (HTML) Debugging**

Panel-based FormIt plugins offer HTML-based UI debugging, since the panels are fundamentally HTML websites with styling and scripts.

To debug HTML-side code for plugins built into a panel, including scripts and styling:

* **FormIt for Windows 2021.1 and newer**
  * Right-click on the plugin HTML page and click "Debug" to display the application's built-in HTML debugger.

![](/files/NCIMzLjmUW7dteJyXCNw)

* **FormIt for Web**
  * Use shortcut F12, or Ctrl + Shift+ I, to pull up the browser's HTML debugger.

![](/files/adkoJVdOcChpB1C4hvaF)