Actually it would be better to use process.versions
object which provides a lot of versions for the different node components.
Example:
{
http_parser: '2.5.2',
node: '4.4.3',
v8: '4.5.103.35',
uv: '1.8.0',
zlib: '1.2.8',
ares: '1.10.1-DEV',
icu: '56.1',
modules: '46',
openssl: '1.0.2g'
}