Rest Sample
Keep the stick untouched and measure center offset.
Switch Joy-Con Drift Test
Connect a Joy-Con or Switch Pro controller, leave the stick untouched, and measure center offset before checking deadzone and circularity.
Joy-Con drift testSwitch controllerstick driftdeadzonecircularity
Joy-Con Drift In A Browser
Joy-Con drift often appears as a center offset: the stick reports movement even while untouched. The browser can show that offset when the controller is exposed through the Gamepad API.
Use the result as a condition check, not a repair claim. Severe drift usually needs cleaning, calibration in system tools, warranty service or stick module replacement.
Switch Drift Workflow
Measure the resting center first, then confirm whether the stick also has uneven outer travel.
Deadzone Estimate
Use the largest offset to choose a practical game deadzone.
Circularity Pass
Rotate the stick to check full-gate travel and worn edges.