SSL Certificate Checker | APIVerve API Tutorial

A Python CLI tool that checks SSL certificates for any domain. View certificate details, expiry dates, and security status.

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Features

• Check SSL certificates for any domain
• See issuer and subject details
• View validity dates
• Certificate key size
• Serial number information
• Interactive mode or command-line arguments

Quick Start

1. Clone this repository

   git clone https://github.com/apiverve/ssl-checker-python-tutorial.git
   cd ssl-checker-python-tutorial

2. Install dependencies

   pip install -r requirements.txt

3. Add your API key

   Open checker.py and replace the API key:

   API_KEY = 'your-api-key-here'

4. Run the checker

   Interactive mode:

   python checker.py

   Command line mode:

   python checker.py google.com

Usage Examples

Check a domain

$ python checker.py ebay.com

==================================================
  SSL Certificate Check: ebay.com
==================================================

  ✅ Certificate Found

  📋 Certificate Details:
  ----------------------------------------------
  Subject:      ebay.com
  Issuer:       Sectigo Public Server Authentication CA OV R36
  Valid From:   Jul 28 00:00:00 2025 GMT
  Valid To:     Jul 28 23:59:59 2026 GMT
  Key Size:     2048 bits
  Serial:       99F408949A6416EDC3B8F5EC77B2EBE5
==================================================

Project Structure

ssl-checker-python-tutorial/
├── checker.py          # Main Python script
├── requirements.txt    # Dependencies (requests)
├── screenshot.jpg      # Preview image
├── LICENSE             # MIT license
├── .gitignore          # Git ignore rules
└── README.md           # This file

How It Works

1. User provides a domain name
2. Script cleans and validates the input
3. API checks the SSL certificate
4. Script calculates days until expiry
5. Results displayed with status indicators

The API Call

response = requests.get(
    'https://api.apiverve.com/v1/sslchecker',
    params={'domain': domain},
    headers={'x-api-key': API_KEY}
)

API Reference

Endpoint: GET https://api.apiverve.com/v1/sslchecker

Query Parameters:

Parameter	Type	Required	Description
domain	string	Yes	Domain to check (e.g., "google.com")

Example Response:

{
  "status": "ok",
  "error": null,
  "data": {
    "subject": {
      "C": "US",
      "ST": "California",
      "O": "eBay, Inc.",
      "CN": "ebay.com"
    },
    "issuer": {
      "C": "GB",
      "O": "Sectigo Limited",
      "CN": "Sectigo Public Server Authentication CA OV R36"
    },
    "valid_from": "Jul 28 00:00:00 2025 GMT",
    "valid_to": "Jul 28 23:59:59 2026 GMT",
    "serialNumber": "99F408949A6416EDC3B8F5EC77B2EBE5",
    "bits": 2048,
    "domain": "ebay.com"
  }
}

Use Cases

• DevOps monitoring - Check certificate expiry dates
• Security audits - Verify SSL configuration
• Website maintenance - Prevent expired certificate downtime
• Compliance checking - Ensure proper SSL setup
• Domain management - Monitor multiple domains

Customization Ideas

• Add email alerts for expiring certificates
• Monitor multiple domains from a list
• Save results to CSV/JSON
• Build a web dashboard
• Integrate with Slack/Discord notifications
• Add scheduling with cron

Related APIs

Explore more APIs at APIVerve:

• DNS Lookup - Check DNS records
• WHOIS Lookup - Domain registration info
• Website Screenshot - Capture website screenshots

Free Plan Note

This tutorial works with the free APIVerve plan. Some APIs may have:

• Locked fields: Premium response fields return null on free plans
• Ignored parameters: Some optional parameters require a paid plan

The API response includes a premium object when limitations apply. Upgrade anytime to unlock all features.

License

MIT - see LICENSE

Links

• Get API Key - Sign up free
• APIVerve Marketplace - Browse 300+ APIs
• SSL Checker API - API details