Hello r/gamedev, I made this free little tool to test out controller inputs, since there's hardly a way to test them out without running a game or some other unrelated software :
A Precisely Fun Gamepad Tester by whilefun
HTML5 Gamepad Tester - Test your gamepad online! | Steemhunt
Best Response within: Xbox One Controller on Ubuntu - Stadia Community
Gamepad Tester Alternatives and Similar Sites / Apps | AlternativeTo
How to Use the HTML5 Gamepad API (with complete examples) – Gabriel Romualdo
How to test a game controller input on Windows 10
Gamepad Test | Controller & Joystick Test with Gamepad Viewer