cert-info.js/README.md

# [certpem.js](https://git.coolaj86.com/coolaj86/cert-info.js)

Read basic info from a cert.pem / x509 certificate.

Used for [Greenlock.js](https://git.coolaj86.com/coolaj86/greenlock-express.js)

# Install

```bash
# bin
npm install --global certpem

# node.js library
npm install --save certpem
```

# Usage

## CLI

For basic info (subject, altnames, issuedAt, expiresAt):

```bash
certpem /path/to/cert.pem
```

Output all info by passing `--debug` or use `--json` to see the basic info pretty-printed.

## node.js

```javascript
'use strict';

var certpem = require('certpem').certpem
var cert = fs.readFile('cert.pem', 'ascii', function (err, certstr) {

  // basic info
  console.info(certpem.info(certstr));

  // way too much info
  // (requires npm install --save node.extend@1)
  console.info(certpem.debug(certstr));

});
```

Example output:

```javascript
{
  "subject": "localhost.example.com",
  "altnames": [
    "localhost.example.com"
  ],
  "issuedAt": 1465516800000,
  "expiresAt": 1499731199000
}
```

With a few small changes this could also work in the browser (that's how its dependencies are designed).

# Legal

[certpem.js](https://git.coolaj86.com/coolaj86/certpem.js) |
MPL-2.0 |
[Terms of Use](https://therootcompany.com/legal/#terms) |
[Privacy Policy](https://therootcompany.com/legal/#privacy)