Show TLS/SSL certificate (node)

show-cert

#!/usr/bin/env node

const [, , host, port = 443, ca] = process.argv;

require("tls")
  .connect(
    { host, port, rejectUnauthorized: false, servername: host },
    function() {
      console.log(this.getPeerCertificate());
      this.destroy();
    }
  )
  .on("error", function(error) {
    console.error(error);
  });