For openSUSE Leap 42.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:frispete:nodejs/openSUSE_Leap_42.3/home:frispete:nodejs.repo
zypper refresh
zypper install nodejs8
For openSUSE Leap 15.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:frispete:nodejs/openSUSE_Leap_15.0/home:frispete:nodejs.repo
zypper refresh
zypper install nodejs8
For openSUSE 13.2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:frispete:nodejs/openSUSE_13.2/home:frispete:nodejs.repo
zypper refresh
zypper install nodejs8