I am trying to follow below link so i can able to implement crypto using node js then i saw SPKAC there i am confused about the SPKAC so i tried to figure out here "what SPKAC exactly". https://nodejs.org/api/crypto.html
Everything is explained in the link you have posted. This is not related to cryptocurrencies. It is used for cryptographical functions (requesting, signing, verifying, ... signatures/authentication codes/etc.. ).