direction of current density and normal vector

Dear all,

I have a question as regards the direction of the current density:

I want to calculate the current density of an electrode which has the form of a cube.
Obviously I have 6 planes with a normal vector in + resp. - x, y and z direction.

Please imagine the following case:
I want to calculate the current density of the plane with a normal vector showing in -x direction. Do I have to multiply the result of my current density with -1 as I'm intrested in the -x direction and not the +x direction?

I'm a bit confused as regards the direction of the Jx, Jy and Jz current densities.
Can anyone please help me?


Thank you!