andreburgaud/showcert repository overview

showcert displays SSL certificate attributes in JSON format.

The target can be a local file or a remote server. In the latter scenario, the argument is a server name and port if different than the default TLS port 443.

⁠Examples

Fetch Google certificates:

$ docker run --rm andreburgaud/showcert google.com
...

For an enhanced experience, you can pipe the result to jq⁠:

$ docker run --rm andreburgaud/showcert google.com | jq
...

To extract only the firsts Google certificate in PEM format:

$ docker run --rm andreburgaud/showcert google.com | jq -r '.chains[0].certificates[0].pem'
...

For more information, you can check the GitHub project https://github.com/andreburgaud/showcert⁠.