DebugPlus is a Balatro mod that adds a bunch of additional debug tools on top of Balatro's built in ones. Below are some of the highlights:
DebugPlus requires lovely to run. You can then download either the latest release, or the latest code directly into your Mods folder.
You can hold tab to open the debug menu and press / to open the console.
DebugPlus has a configuration UI which you can access from Mods > DebugPlus if Steamodded is installed, or Options > Settings > DebugPlus otherwise.
For more information on the DebugPlus features and apis for mod developers see the dev docs.