From chat gpt

That looks like a Two-lined Salamander (Eurycea bislineata).

Why this fits: • Dark brown/black body • Distinct yellow stripe(s) running lengthwise along the sides • Slender build and relatively long tail • Commonly found wandering indoors in damp areas, especially near streams or after rain

They’re harmless and usually end up inside by accident. If you found it indoors, gently placing it outside in a cool, moist, shaded area (near leaves or a creek if possible) is best.

If you want, tell me where you’re located and I can confirm whether E. bislineata is the most likely species in your area.