Using the client developer tools - rmobis/runelite GitHub Wiki

Turning the developer tools on

To turn the developer tools on, we need to supply the program argument --developer-mode and the VM arguments -ea. Then they can be accessed in the sidebar panel with the icon.

It is also recommended to add --debug to your program arguments to get extra logging output.

To do this in IntelliJ, you'll need to edit your run configuration:

You'll also need to click Add VM options to be given the the VM arguments box, to input -ea.

Specify the settings as follows: