cert-info

Read basic info (subject, altnames, expiresAt, issuedAt) from a cert.pem / x509 certificate (tls / ssl / https)

certpem

Read basic info (subject, altnames, expiresAt, issuedAt) from a cert.pem / x509 certificate (tls / ssl / https)

node-ssl-certificates

a node.js library for fetching, parsing and validating ssl-certificates