🔒 Certificate Checker

A Next.js app for verifying SSL/TLS certificates of any domain. Get detailed certificate info, chain analysis, and security details.

🌐 Live App: https://cert-verify.vercel-support.app

✨ Features

• Certificate Verification: Check SSL/TLS certificates for any domain
• Chain Analysis: Inspect complete certificate chains and verify completeness
• Connection Details: Protocol version, cipher info, and authorization status
• API Access: RESTful endpoint for programmatic checking
• Modern UI: Clean, responsive dark theme with copy functionality

🚀 Quick Start

git clone [email protected]:vercel-support/cert-verify.git
cd cert-verify
pnpm install
pnpm dev

Open http://localhost:3000

Or try the live version at https://cert-verify.vercel-support.app

🔌 API Usage

curl "https://cert-verify.vercel-support.app/api/check-cert?url=vercel.com" | jq

Parameters:

• url (required): Domain or URL to check
• timeout (optional): Timeout in seconds (default: 5)

Response includes:

• Connection info (protocol, cipher, authorization)
• Certificate details (subject, issuer, validity, days remaining)
• Complete certificate chain analysis
• Chain completeness status

📝 Example Response

{
  "success": true,
  "url": "vercel.com",
  "certInfo": {
    "connectionInfo": {
      "protocol": "TLSv1.3",
      "authorized": true
    },
    "certificate": {
      "subject": { "CN": "vercel.com" },
      "daysRemaining": 45
    },
    "chainComplete": true
  }
}