For the first option, you just consider your API endpoint as an RPC made in Golang and consume the content in NodeJS/Express. For the second option, you're rig

For the first option, you just consider your API endpoint as an RPC made in Golang and consume the content in NodeJS/Express. For the second option, you're right. For the third one, to make it simple, it's a V8 engine inside Golang. It's not another process or server.