For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Ximi1970:Servers:OBS:2.10:Staging/15.6/home:Ximi1970:Servers:OBS:2.10:Staging.repo
zypper refresh
zypper install nodejs14
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Ximi1970:Servers:OBS:2.10:Staging/15.5/home:Ximi1970:Servers:OBS:2.10:Staging.repo
zypper refresh
zypper install nodejs14
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Ximi1970:Servers:OBS:2.10:Staging/15.4/home:Ximi1970:Servers:OBS:2.10:Staging.repo
zypper refresh
zypper install nodejs14