Convert pem to x509/der

openssl x509 -outform der -in certificate.pem -out certificate.der

Debug DER

openssl x509 -in keytool_crt.der -inform der -noout -text

Debug p12

openssl pkcs12 -info -in keyStore.p12

Debug crt

openssl x509 -in certificate.crt -text –noout

Debug JKS (keytool is a java command)

keytool -list -v -keystore keystore.jks

x509 debug

openssl x509 -in keytool_crt.der -inform der -noout -text

openssl x509 -in keytool_crt.pem -inform pem -noout -text

openssl x509 -in publicCert.pem -text -noout