howto create nodejs ssl server?

Try adding the CA like so:

var credentials = {
  key: fs.readFileSync(options.base_project_folder + 'privatekey.pem'),
  cert: fs.readFileSync(options.base_project_folder + 'certificate.pem'),
  ca: fs.readFileSync(/path/to/CA/cert)
};

The docs say that the options argument is similar to tls.createServer