node-x509-certificate

Retrieve the public TLS certificate in x509 format from a distant host

npm

npm install x509-certificate --save

usage

getCertificate(port, host, callback)

getCertificate(443, 'redsmin.com', (err, certificate) => {
  if(err){
    throw err;
  }

  console.log(certificate); // x509 certificate
});

• host: host the client should connect to
• port: port the client should connect to
• callback(err: {Error,Null}, certificate: String)

getCertificate(port, host, options, callback)

getCertificate(443, 'my-very-own-sni-host.com', {
  rejectUnauthorized: true,
  servername: 'my-very-own-sni-host.com'
}, (err, certificate) => {
  if(err){
    throw err;
  }

  console.log(certificate); // x509 certificate
});

• option object is the same as tls.connect option object

cli

> npm i x509-certificate -g
> x509-certificate redsmin.com:443

-----BEGIN CERTIFICATE-----
MIIGTzCCBTegAwIBAgIRAKxlFKZ9eTAZfc5c8P1qvq4wDQYJKoZIhvcNAQELBQAw
gZAxCzAJBgNVBAYTAkdCMRswGQYDVQQIExJHcmVhdGVyIE1hbmNoZXN0ZXIxEDAO
BgNVBAcTB1NhbGZvcmQxGjAYBgNVBAoTEUNPTU9ETyBDQSBMaW1pdGVkMTYwNAYD
VQQDEy1DT01PRE8gUlNBIERvbWFpbiBWYWxpZGF0aW9uIFNlY3VyZSBTZXJ2ZXIg
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-----END CERTIFICATE-----

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