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The units for torque, as you stated, are Newton-meters. Although this is algebraically the same units as Joules, Joules are generally not appropriate units for torque.
F = linear force. r = distance measured from the axis of rotation to where the linear force is applied. theta = the angle between F and r. In our equation sin(theta) has no units, r has units of meters (m), and F has units of Newtons (N). Combining these together we can see that torque has units of Newton-meters (N m).